4 of them are already schooling (2 newest ones and 2 of them that I got a few days prior). It's just the other two I'd bought that keep hiding in my heavily planted tank. I have huge bunches of water wisteria, pennywort, & moneywort in my left back corner, with dwarf hairgrass beginning to carpet my tank floor, 2 bunches of dwarf sagittarius in the right front corner, and one Utah Ice rock in the back right corner, naturally hiding my sponge filter. They keep hiding in the forest that is all my water wisteria, but only emerge for split seconds just to catch and eat any brine shrimp, TetraColor flakes, or any leftover "Hikari" Fancy Guppy food that happens to fall in front of their "zone".