How big are the damsels currently? Might have to get clowns that are a bit bigger than they are and get them established first. Might be a bit better in the 20 gallon but live aquaria does suggest a 30 gallon tank for them. Might be more about footprint as well, assuming they are going by standard tank size.
Hopefully someone with experience mixing clowns and damsels will chime in. It gets very complicated trying to mix two pairs of semi-aggressive fish in the same tank. Ocellaris clowns are peaceful until the female hits maturity, then it all changes. I would hate to say go ahead and do it and you end up with major aggression or territorial issues.
Bioload wise i think it would be a bit tight but probably okay, but that really depends if they can tolerate each other to maturity. I imagine the damsels would claim the tank if you add them first but that’s just going by what I have read about their behavior.
I have yet to do a damsel tank but if I did it would probably be only damsels. Have had the itch to try a species only tank of neon damselfish but they are rarely available and need a good sized tank to have a group.
Hopefully someone with experience mixing clowns and damsels will chime in. It gets very complicated trying to mix two pairs of semi-aggressive fish in the same tank. Ocellaris clowns are peaceful until the female hits maturity, then it all changes. I would hate to say go ahead and do it and you end up with major aggression or territorial issues.
Bioload wise i think it would be a bit tight but probably okay, but that really depends if they can tolerate each other to maturity. I imagine the damsels would claim the tank if you add them first but that’s just going by what I have read about their behavior.
I have yet to do a damsel tank but if I did it would probably be only damsels. Have had the itch to try a species only tank of neon damselfish but they are rarely available and need a good sized tank to have a group.