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If those are indeed Dino's which they appear to be -- it is a long tough battle. No chemicals on the market will treat it. Chemicals only make the situation worse causing so many other issues throwing the eco system out of balance. The only treatment that seems to make a dent is elevating N03 & P04 levels along with pulling out your sand bed. A UV works depending on which strain of dino you have.
If your N & P levels are zero i would start by boosting up those levels. Avoid chemicals if at all possible. Just my $0.02
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