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When you touch it is it soft or like astro turf? also when you pulling off does it peel off the rock or the roots are dug in?... The green skimmate i have no idea.. Do you feed with green flakes or anything green?
The key thing in identifying Dinos is when the lights are on you will see air bubbles at the tips of the snot... just a shot in the dark here and what i see in the pic it looks more like turf algae
Yeah i have seen them before.. But i would go the easy and cheapest route first but that's me.. Plus with the air pump you know for sure the oxygen is getting into the water to raise the PH.. It's easier and cheaper to make one or two 1/4 inch holes bigger then adding a fresh air system...
Something like this but find one that suits your needs... http://www.marineandreef.com/Aqua_Lifter_Water_Air_Pump_Tom_Aquarium_Products_p/RCPR01137.htm