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What would be the best way to kill a mushroom or in my case couple dozen without hurting or affecting anything else in my tank I have tried pulling them off and I do but they grow right back
Thanks in advance
Super glue over them after you cut them off or use marine epoxy. It's very hard to get rid of them. I one time had a rock covered in them and I was able to take the rock out with no problems. I took it to work and power washed it with my gas power washer. About a month or so later one popped back up.
With the amount you have, you may never fully get rid of them completely without removing the rocks. Your tank looks like a future one of these(see below). If you do go the way matt mentioned I would go the way of superglue or else you would end up having to epoxing the whole of a couple of rocks.