I have heard alot about neon tetras being problematic, i had no troubles with mine until the last few days where i've had four die in four days! the first and third ones to die have kind of been shrivelled up looking like an egyptian mummy when they died and their bodys were curled up one way or the other, the fourth whom died today was extremely healthy looking tho, nice bright colours and plump body! The second one to die, well couln't say about him, his body still has not been discovered yet??? is the dreeded neon disease? They have all been healthy looking, and seem to be schooling and darting about happily, but every day i have got home another one has bitten the dust, Ive only got four let so here's hoping!!!
Sorry bout the long post