I have a 5 gallon Eclipse hex, it's been running for over a year. The betta I had in it just died...so I just bought another betta today, as well as a tiny gold pleco. If the pleco gets too big, I'll put him in my 55 gallon. Can I add any other fish to this tank? I don't want anything that will bite the bettas fins. I have other tanks, but they are all bigger...and this 5 gallon has only ever had a betta in it...this is why I'm looking for suggestions! Thanks!