I'm so sorry about Sixxie; how sad about her passing. I got a 'bottom feeder' for my tank, and although he didn't bite my betta's fins, he sort of chased him around, so I took him back to the store where I got him. I was afraid that he was stressing Percy out and I don't want anything to happen to him.

I also tried some snails, but have had no luck with them. For some reason they all die within a few days.