I'm having trouble finding another small school or center piece fish to fill our 55 gallon tank with. Currently we have: 10 Harlequin Rasbora 10 Cherry barbs (all females) 1 RTS (I think it's a female, could be wrong) Either way the shark is fairly peaceful and keeps to itself mostly. We had 2 mystery snails, however they didn't last longer than a month. I'm not sure if they came to us sick or if our nitrates were too high for them. I do have live plants, but I'm not sure how much they are helping the highish nitrates. I was thinking of either doing a small school of bottom dwellers as our shark inhabits the entire tank not just the bottom. I also have 3 "caves" that are not being used currently so there would be plenty of places for them to hide if need be. I am also looking to add a lot more plants. I have not found many bottom dwellers I like though. I'm not a huge fan of corries or plecos. I was considering 2 females and a male swordtail, but I'm not sure how the male would get along with the shark? What else would you add or would you just up the schools we currently have? I wouldn't mind just the 2 schools, I do love our barbs and harlequins. Our tank simply looks so empty lol.