So I’m planning a 15 gallon exclusively for glofish. Currently I’ve got about five glofish tetras and one pristella glofish, who I got as a regular glofish tetra and only realized like a year later that he was a pristella. The stocking would probably be six of each type, plus a dwarf gourami as a centerpiece if I have the space. Heavily planted. Actually a 20 gallon long, but I’m planning to divide off about five gallons for a betta. If it’s too small, I can probably convince my parents to let me keep my betta somewhere else and give them the extra five gallons. The tetras aren’t too active, but the pristella…not so much.