7month old bangaii cardinals

[i have crabs]

i have 2 in a 20g from a batch i had a while ago and 1 is starting to chase the other around so i think thier both males so they have to go and they cant be housed with eachother so thier up for adoption if thier is a good home i also have 1 small green cromis that got kicked out of the group he was in and a 4striped damsil slightly agressive but mostly a chicken and a figure 8 puffer that got beatup fairly good by 2 triggers so i addopted him a while ago with the damsil hes healing up good and is a nice fish that needs a home.