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FAQs on Vesicularia, Java Moss for Aquariums

Related Articles: Java Moss in Planted Aquariums

Related FAQs: " Mosses"  

Few questions; Java Moss use        8/7/18
Gday Neale
Hope you’re well mate
<Can't complain, me old cobber.>
Just got a few questions for you hopefully you might help me out.
<Sure thing.>
I’ve started to build a wall in my tank with plastic mesh and java moss it grows crazy in my tank....
<Yes. Often does, once it takes. Odd stuff, Java Moss. Sometimes thrives; sometimes miserably hangs in there.>
My concern is that behind the walls will it become “dead spots”. The fish do go behind which I’m hopefully going to stop soon and give the shrimps that are in there a place to live “behind the scenes” once all the walls are complete.
<Understood. There is some argument for giving the moss a hair cut periodically if the dead spots are substantial. This is akin to the theory of algae scrubbers, where a 'turf' of green algae on mesh panels helps to filter the water, but if the turf becomes too thick, the efficiency of this diminishes as water movement reduces. But that said, tiny shrimp babies and fish fry thrive inside dense thickets of moss.>
Do you think this will be an issue with dead spots?
<It can be if you find the moss deep inside the thickets turning brown and/or trapping a lot of silt. Not dangerous bad, but unsightly, and not doing anything useful. But if the moss is green all the way through, it's probably fine, and doesn't need any particular help from you.>
please see photos below
<The tank looks awesome, to be honest, and there's nothing wrong with encouraging the moss to cover as much of the back pane as you'd like. Everything looks perfectly healthy to me. Cheers, Neale.>


Idea for creating a cave  8/8/09
Dear WetWebMedia,
Thanks for this site and your work. I have learned a lot on here, and I believe that's why my tanks have done well.
<I am glad you have benefited from our efforts>
I have 10-gallon tank with a male Betta (not sure of his age, but he's been fine for months and has healthy-looking fins and color). He shares the tank with five leopard Corys, a pair of Otos, some watersprite and a potted Swordplant. The tank has several rocks and light gravel (large pebbles, really) covering most of the bottom of my tank. I have an idea to create a cave by laying a small glass jar or clay pot on its side and tying java moss to it until it takes and grows on its own. What do you think?
<A clay pot will be better looking and functionally than the glass>
Would java moss grow on a jar or pot?
<Perhaps on the latter; not at all on the former>
Thanks so much.
<Welcome. Bob Fenner>

Runaway Christmas Moss 9/9/08
I am having a problem with runaway Christmas Moss.
<This is the Java Moss look-alike Vesicularia montagnei, right?>
I bought a plant package which included Christmas Moss. Prior to ordering I talked to the grower about my needs. Mainly, that I was creating a Discus Tank, and needed warm water plants. The temp in my 72 gallon tank is around 84 degrees w/o heater, with the lights on. ( I live in Florida) The Christmas Moss has turned to brown, and has spread to all areas of the tank.
<For one thing, this is way too hot for Vesicularia montagnei, a cool-water species. That would likely explain both its rapid growth and subsequent exhaustion (turning brown).>
When I try to pick it out of the other plants, it fragments apart and spreads through out the tank. It is clogging my other plants leaves, and ornaments. It is too fine to pick out.
<Ah, the best approach here would be to remove clumps while siphoning out the water, so that the loose particles go right up the tube. Sharp (e.g., surgical) scissors would be a great help.>
Our fish are old and big. Jack Wattley Discus are very expensive. We worry about having to tear the tank apart, or pulling all the plants out, and moving the fish.
<Those are some pampered fish... mine certainly don't get that kind of treatment! If they have to put into a bucket, off they go! But you'll know your fish best.>
(Having anaerobic problems before when replanting. before.)
<Anaerobic problems are more mythical than real; while you certainly can get anaerobic decay, the resulting gases oxidise immediately they come into contact with oxygenated water. In ponds and marine tanks anaerobic decay is part of the system; it eludes me why freshwater aquarists get so paranoid. Have yet to hear a single example of any fish being harmed or killed by gases coming out of the substrate. There's always a first time though, so maybe you'll be the one!>
<Lucky Bob F. didn't see this or you'd have had your knuckles rapped.><<I am seeing... red... Heeee! RMF>>
<You might try adding a Panaque. These catfish certainly remove and perhaps consume Java Moss in my tanks, and being peaceful and retiring fish shouldn't cause problems with your Symphysodon. At the very least they'll dislodge and limit the spread of the existing Moss as they hunt for algae. You can then siphon out what's loose, or pipette out with a turkey baster. Panaque don't do the "sucking on the mucous" thing that certainly other Loricariidae have been noted for. All they want out of life is bogwood and vegetables. Various species and sizes, including Rio Xingu forms ideally suited to very hot tanks like yours. Cheers, Neale.>

Re: Runaway Christmas Moss  9/10/08
Thank you for the return email.
<Not a problem.>
The reason I mentioned anaerobic fluctuations affecting my fish, and was seemingly paranoid, was my past incident. Prior to a past weekly water change, (40%) I did some aquascaping. I move 3 large plants, replanting them. After doing the water change(aged, treated water, as usual) I noticed the Celebese Rainbows at the surface trying to breathe.
<Ah, sounds as if the sudden release of anaerobic material was consuming the oxygen from the water too rapidly for the fish to be happy. Certainly possible and sounds alarming.>
I tested for nitrates, which where very high, I turned on the air stone, and dosed the tank with Super Bac which nullifies nitrates, and thought I had avoided any fish loss.
<With the spike in nitrates, again, this does sound like there was a lot of incompletely decomposed organic material in that substrate. Your question here has to be where was this nitrogen-rich material coming from. Obviously the only major source of nitrogen is protein, and that comes almost entirely from either food or dead animals. So going back a bit further, your next question has to be where were these coming from: were you overfeeding the tank, or not cleaning the substrate adequately, or what. The classic anaerobic gas that people say poisons their fish is H2S, but that clearly doesn't cause a spike in nitrates; if you're getting a nitrate spike, then somewhere along the line food/corpses are involves, simply because the nitrogen has to come from somewhere.>
However I did loose some of the rainbows a few days later. They seemed not able to breath, hanging at the surface. Luckily, the Discus were not affected.
<Interesting difference in reactions. My guess would be that because Discus are less oxygen sensitive than Rainbows (these latter being active, stream-dwelling fish) that the actual cause of stress/mortality was oxygen deprivation caused by a rapid increase in biological decay.>
Asking more experienced folks, (like you) at Wattley's' Discus, and Big Al's, they diagnosed the issue as anaerobic fluctuations.
<And what precisely does "anaerobic fluctuation" mean? One issue I have with fishkeeping (saying this as a scientist with the PhD to prove it) is that while many expert hobbyists are very good at diagnosing problems and making practical recommendations, they often stick bogus explanations on to the end of what they're saying. In this case I think the explanation "anaerobic fluctuation" doesn't really explain anything.>
I inquired as to how to aquascape without fish loss, and was told to follow the replanting with 100% water change.
<This is what I do. I put the fish in 5 gallon buckets with filters and heaters if necessary. Aquascape the tank, and then fill with new water. Once that's done and I'm sure the water chemistry/temperature isn't too different, I tend remove 50% of the water from the buckets, fill them up with water from the tank so the fish get exposed to the new conditions for a while, and then move everyone back to the tank. Generally problem-free.>
I am since paranoid about the incident, and have not replanted since.
Thanks for all your help!!!
<Good luck, Neale.>

Java Moss consumers Hi Bob, I need an underwater lawnmower to help control the growth of Java Moss that has attached itself to everything in a customers tank. Do you have any recommendations for herbivorous fish or fishes that will consume Java Moss? Regards, Shayne Smith <Mmm, don't know of any consumers of Java Moss off hand, but do know where I would ask next: http://www.thekrib.com/  Bob Fenner> 

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