Coraline doesn't grow on them. They get dirty with algae. The colors fade quickly and the best way to clean them is to remove them and soak in bleach water for a few hours then rinse thoroughly and air dry before returning it to the tank.
They are similar to the ones made by ATM for the Scheels tank and they are work to keep clean.
My ocean. 90g (yup, won it!), 40g, 28g, & 10g Systems PADI Advanced Open Water Tank Thread:
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