I have a small piece of very porous lava rock which has been in my tank for a while and been used in my aquariums for about a year, so it is not polluted. I have a green mushroom, not sure what kind but when it is under light it is a fluorescent green, and when it is fully expanded, it is about 2in in diameter. What would be the best way for me to attach this thing onto the rock?
Thanks.
Thanks.