hi,i have recenly had a pair of discus in a 5ft tank which have layed eggs at least 6 times,but each time the eggs just go white fungused?i know there a pair i have watched them do the process,i thought the male my be in fertile so i have replaced them for another pair but i am having the same problem,so im wondering if it could be my water conditions that are causing the eggs to go fungus? or im i being stupid?