G Gaxmode New member Aug 22, 2016 #1 These are growing on and around my heater in the sump. Are they a type of sponge? Harmful? Thanks
SeaCucumberFan New member Aug 22, 2016 #3 PsychoticBeauty said: Pineapple sponges. (harmless) Click to expand... This. They look like snails though lol
PsychoticBeauty said: Pineapple sponges. (harmless) Click to expand... This. They look like snails though lol