sounds like your using tap water corect? if so stop, i used it for a long time and battled algae the whole time invest in a ro/di unit it will save you in the end
since your using tap water have you been adding prime to detoxify? if you dont i would think that could be the snail problem.
why the heck is your calcium so high? calcium will aid coraline growth but yours is way to high and the type of calcium you add will determine whether the coraline will use it quickly or not,liquid calcium additive is best. but you need to get yours down in the 400-500 range,what tesk kits are you using?
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but what the heck do i know
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