Try to keep it, if you can without damaging it when you take it off and don't expose it to air the particular one. You can put it to stuck in a crevice on you LR, and let it grow up, isn't infestation one, and it's good to have the sponges like this one, because they are filter feeders, so they remove some bad substances from your water, assimilating most of the silicates which usually another bad bacterias use, isn't harming anything, it's good for the eyes if you like the color of your, just leave it on area where after it grow isn't going to outcompete anything, isn't fast growing.