Nice! I have a 1.1 gallon. Avoid gsp, or fas growing species.
I’ve have tried 3 or 4 different baby torches, and a frogspawn and they all outgrow the tank in a few weeks.
Button scoly would be great pico centerpiece, acans, zoanthids, things like that. Firework cloves also look nice and do good with gentle flow of picos