ive been putting liqiud oxygen in there for a while i put 15ml of liqiud oxygen in my 30 litre tank but i was told to much liqiud oxygen will kill all the microlife ive been giving my plants (canna zym). il be happy to just leave it alone if i new it wouldnt kill my crop before its ready, but ive not got this problem with the trays in my veg room......