In my opinion cyano is mainly due to poor circulation ... what happens as a result is detritus/food buildups that in turn leach phosphates which then feed the cyano bloom ... so take a close look at circulation and see if there is enough water movement so as to maybe prevent it from coming back later on. HTH
Cheers
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Steve
“The most important decision you make is to be in a good mood.”
― Voltaire
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