What do you guys think about adding a group of 3 blue-green chromis to my Elos Mini 25gal cube with a small, non-hosting ocellaris and a small royal gramma? The rockwork is low profile and there is plenty of open water column for swimming. I tried just one a while back and it disappeared without a trace. Thinking maybe a group of 3 would be less stressed? Other inhabitants is a skunk cleaner shrimp and 2 or 3 snails and hermits.