My nymphs started dying a week ago and i don't know why, i thought it might be there food or there water but i changed both and washed the orange i put in. The symtoms are twitching of the legs, going on there back, inability to walk, seizuring of the stomach and convulsions, and the othern nymphs are eating each other, its only happening to the nymphs and it even happened to one of the bigger nymphs. Please help i need helpe ASAP or all my nymphs will be dead!