i would be really, really worried about putting a fiddler in a tank with fancy goldfish, even in a 35 the goldfish are in danger of getting their fins ripped or even getting killed (if the fish is small enough, or the crab large enough). Fancy goldfish, correct me if im wrong, are really slow swimmers, and would be in trouble. Not to mention that you would need something to allow the fiddlers to get to the surface, and that would be really tough in a full 35gal. I believe that the fiddlers also prefer warmer water, but agian, not sure.
imo, avoid crayfish and fiddlers in your tank if you plan on keeping fish.
imo, avoid crayfish and fiddlers in your tank if you plan on keeping fish.
