Yeah id say tap water is your problem cyno will stay if there is too much nutrients in your tank. If you have a sand bed, Photophate has probly soaked into the sand and rock. It will take a coupe months for it to clear up. Using consititant RO-DI water changes.
-you need to manage your cal and alk level for coraline to grow.
-Snails you need to slow drip accumlated them.
-POD's really only reproduce if you have a fuge. I wouldnt worry too much about this because once you add fish there toast anyways.
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