I have 2 cleaner shrimp that i have had in my 55g for a while now, and i have them trained to be hand fed, i also have 1 fire shrimp that has been in there for about 3 months now, i see him when he sees the pellets, but thats about it, i plan on upgrading to a 90g soon, and was wonderig if this is a sufficient amount of space for maybe a coral banded, and/or maybe another fire shrimp.