Does anyone know what this cobweb/cotton like stuff growing on my driftwood is? It smells pretty bad and has a slimy texture. I’ve taken the driftwood out and tried scrubbing it multiple times but the stuff keeps growing back. I’ve also left it there to see if it goes away on its own but it just gets worse. It also only seems to grow on the driftwood. Any ideas on what it is and how to get rid of it?