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As ok.A 20 gallon is too small for a twinspot goby, they need a larger tank & tons of food, they’re sand sifters, the other 2 should be fine, hope this helps
As ok.
Liveaquaria recommendation was 10 gallon minimum but I guess it's not really suitable for small tank. It says difficult level to care. Any other fish recommendation for sand shifter that can be in small tank?
Thank you