So I am new to saltwater/tanks in general and I wanted to know if I would have room for a flame angelfish and a sand sifter goby. Currently I have a 29 or 31 gallon bio cube (I don’t know which) and as of now i have 2 of ocellaris clowns, a purple dotty back, and a skunk cleaner shrimp. I keep salinity around 1.22-1.25. temp is 70-73. Thanks in advance.