ok so i have these two big pieces of mopani driftwood in my tank, they have already been in someone elses tank for a few months and now they have been in my tank for about 4-5months, since then it has grown this really gross looking clear, thick gooey algae of some kind all over the tops of the pieces. i thought this was just something that it would grow since it was new to the tank and that this would go away but its 4-5 months later and the stuff is still growing i have taken the wood out and totally scrubbed it down twice and it still grows back, its really disgusting looking, is there anything i can do to get rid of this? i do 50% weekly wc, and my nitrates never go above 20 and i dont even have any algae growing on the glass just on this wood, its really driving me crazy, would getting a "chinese algae eater" help, would it eat the stuff off of the wood?