I have these dead branch rocks and some denser rocks that I think will be useful for a sump. Reason why it's free is because the previous owner of these rocks had hydroids/different types of algae. I recommend that you do an acid dip to kill of those algae spores. I used one of the rocks in my setup and I'm finding random algae I've never seen before. I'm not too sure if it's nuance or not but I'm trying to kill them anyways. I think the branch rocks was ~10lb and the denser rocks is about ~15lbs.
