Will 3 fancy goldfish (2 black moor, 1 calico) be healthy in a 40g tank? I know its a foot shorter than my 55g but my 55 is getting crowded and would like to move these guys if possible. They wouldnt have any full size tankmates maybe some feeder fry growing in there. Im pretty good at keeping up with my water changes and plan on having pretty heavy filtration. Thanks.