hello I have a 8.5-month-old 20 cube and I have 2 clownfish and a royal gramma and firefish do you think that has enough space to add a small wrasse or fairy wrasse or shrimp goby I got rid of my nassarius snails so they can't hurt any of the things that sleep in the and bed I learned from my courtline goby thanks I'm pretty new so thanks for the help.