Brackish (?) goby for a Canadian
I'm living in Canada and looking to purchase some brackish water gobies for my tank. I own a 30 gallon tank and looking to buy a butterfly goby and one I saw on Google known as the.....Amblygobius semicinctus.  If you have any of these fishes or know where I could get them.
<Mmm, we don't sell livestock... and this fish, genus is better kept in full seawater. Bob Fenner>

Amblygobius phalaena: Tank Too Small? – 04/08/08
Hello WWM-ers!
<<Greetings!>>
I have a 24 gallon JBJ nano cube and I do not have a refugium. I do 10% water changes every week and the water quality is usually excellent. I have a common clownfish (Amphiprion ocellaris), an orchid Dottyback (Pseudochromis fridmani), some turbo snails (6-7), a red legged hermit crab, and some pink xenia. While I was away this weekend my father bought me a male Amblygobius phalaena.
<<I too have one of these, a great fish…excellent substrate stirrer/sifter, which is necessary to the long-term health of this fish >>
He is about 4 inches.
<<Will get larger…about 6” overall>>
He looks fantastic, is surprisingly outgoing, and has been feeding voraciously for the past two days.
<<Yup>>
Over this short amount of time he has almost completely eradicated the filamentous algae in my tank, which I felt was somewhat abundant.
<<Neat>>
However, my research over the past few days have me concerned that my tank is too small and not mature enough for a fish with this kind of appetite.
<<Mmm…the appetite can be supplemented…but yes, a mature larger system; with a deep bed of sugar-fine sand, would be a more appropriate environment.
In addition, he has been biting occasionally at my Caulerpa. Does this mean that he is running out of food?
<<Maybe just searching for food organisms…how much/what types of foods do you feed?
Is my tank simply too small for this kind of fish?
<<Probably…especially so if you don’t have an appropriate substrate for this fish>>
Can I keep him and start feeding him mysis or brine shrimp, or should I simply take him back to my LFS before his health declines?
<<Meaty foods will be heartily accepted…and even New Life Spectrum pellets ( a “very good” dietary supplement for ALL your fishes). But the issue of environment must be considered. Ideally the fish should be in a larger tank, but if you have a fine-sand substrate and can keep it fed well the fish will probably be fine (but this pretty much “fills you up” re any more additions). Though if the purpose of the sand bed is nitrification…once A. phalaena starts digging in a tank this size, it can render a DSB a moot point>>
Thanks so much in advance!
<<Happy to share. EricR>>