just my opinion but using chemicals to mask te underlying problem is not a solution. NOt to place fault on any one here but something has caused this occurance and you need to find it and solve it the natural way before using a chemical in your tank. although I am sure that person have had success using a chemical to fix a problem how many can truly say that the problem stays away permanently or that some other "thing" did not arise? Just my opinion fellas not trying to get at any here. I may be wrong buut I may also be right. your choice is just that,..........yours.