I agree with this 100% if I were u at such a young age(like me) I’d focus on a fish. For example in a thread a few days ago I talked to u about me and my catfish room, if I where u at a 30g right now gouramis, guppies, and I saw someone say something about killifish, killifish have awesome colors and are predatory and easy to breed. Just would need to be dark and have peat moss. Maybe you can breed them but try to find a fish YOU love I understand you like predators and so do I but you have to deal with what’s reasonable and what you have. If you do catfish like me you can get a gulper in a 55, 4 jag cats in a 75 and maybe Cory or a small kind of syno cat for the 30 it’s ur preference.