DrFish’s advice is good; the algae eaters, are they the little ones or are they the plecostomus. If not you may consider getting one of these larger sucker-mouths. They do a really good job at cleaning the glass, the gravel as well as the plants. But if you preferred not using these, try an algaecide, one that I like is Algae Away for outside ponds. But you can’t have algae eaters if you used this product for they will starve to death. Good luck.
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