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the little algae attached to the screen was completelly White, what could have happened
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Sounds like detachment. Common for waterfalls, in bigger screen sizes, if the lights can't burn through to the middle of the screen in order to let water in there. The bigger size has no way for water to get to the middle when it's full.
Need first to clarify what type it is. A horizontal river is a trough, with a mesh on the bottom, and is 1-sided (the top). A floating one however is usually a bubble upflow, maybe with strings, which would be 2-sided.