Hello, I have a bleeding heart tetra that has been in my 23 gallon tank for about two or three weeks now. I started out with four bleeding hearts and planned to get two or three more because they kept nipping at each others' fins and I read they are schooling fish and need buddies to reduce fin nipping and stress. Long story short: all but one of my bleeding hearts died shortly after I got them and I'm having trouble finding healthy bleeding hearts, if any, at my LFS. Are there any alternatives that I can get for her to school with? I'm pretty sure she's a female because she has a rounded dorsal fin instead of a sickle-shaped one. The only other fish I currently have in the tank are a couple of male delta guppies. I've also been thinking of getting a platy or two sometime in the future if possible after finding tank mates for my bleeding heart. Thanks!