snail issue; control. And plt ID
Hi Neale, hope you are well. My tanks are doing well, so I haven't
needed advice lately.
Here is a photo of a plant I'd asked about before. Someone told me
it's probably called naja grass. What do you think, have
you ever seen it?
<Certainly looks like Najas guadalupensis. But no, I've not
seen or kept it. Seems to be rarely traded here.>
It has long stringy roots but doesn't succeed in being planted for me at
least in the lower light setting.
<Correct. It looks much like other aquarium "tangle weeds" such as
Ceratophyllum demersum and Elodea spp. Basically, it wants to be left
loose, floating under bright light, and it will send down white roots to
form loose anchors onto the sediment. It'll grow from the waterline
downwards rather than from the substrate upwards.>
It tends to have explosive growth like the java ferns if it is growing
tangled among other floating plants.
The one I'm referring to in this picture is in the center and not the
annubias or the water wisteria/water sprite(i have both or one of
It's lacy and the roots are floating too.
Here is my real question though:
In your experience, do assasin snails ever get each other ever?
<Possibly, but this seems rare.>
I originally had 5. Some time back I found one smaller empty
Lately I had only ever been aware of 3, though it's possible one is
But today I noticed another empty shell, this was one of the larger
ones.... It's been there unmoved upside down since yesterday. I had
hoped these critters would eventually breed and not cannibalize. I
have heard stories that they do reproduce, but I have seen no evidence
<Ah, they do breed. But they're also unusual in not being
So if you (unluckily) got few/no females, then your population would die
Would they ever react badly to a water change, are they sensitive or
<They seem fairly hardy.>
It's heavily planted. This time I cleaned it a little more
thoroughly in the vacuuming, I changed a little more water than
typically (45% maybe as opposed to 25-30%, and my tank has a larger than
needed filter for currents), but there's also lots of decor and plants
and a well established filter, and the snails were removed and kept in
their water during the cleaning. The fish have shown no signs of
stress. They even gave birth since the cleaning. The endless
lime green endlers....
Do the assasin snails eat baby cherry shrimp?
<Some reports suggest they can, but it probably depends on many factors
including whether the baby shrimp had places the snails couldn't go,
like behind/inside filters, and how many of each you started off with.>
That tank could use some resident snail cleanup, but I would hate to
stick one in there and have him feasting on shrimp instead. I'm
wondering if there's anything that could coexist with them and do snail
patrol that wouldn't eat them too.... Probably not.
<I wouldn't keep Assassin Snails with my *only* group of Cherry Shrimps,
but I have combined them in one aquarium while keeping another
population of Cherry Shrimps going without Assassin Snails in another
The funny thing...I have never seen one eating a snail, even with baby
snails in the near vacinity. One in particular has been very
active since the clean. I wonder if he was the culptet in the
<Oh, Assassin Snails can/do eat snails, but they're scavengers more than
anything else, so if there is other food, they'll eat that as
<Most welcome, Neale.>