Planted tank, with 6 yellow glofish and a couple firemouths. Think I'll be adding a couple ottos as well, or possibly a bristlenose pleco. But wondering about a gaggle of tetras. I've been to LFS, only has head and taillights, red eyes and candy canes. Think their colours are too similar to the firemouths. Looking for a complimentary colour to what I already have. My water is quite hard. Tank is planted fairly heavily. Suggestions? Or possibly other fish, looking more for a schooling/schoaling fish. Thanks!