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if you choose to do it underwater try your best to not let any fragments of it land somewhere else, failing to do so could cause them to start growing in multiple other places.Thanks.
If I scrape or brush them off could this be under water or does this have to be in air cause my rocks are glued together.
Search on here to find lots of info, but many angelfish and I read the other day that some puffers will as wellAre there any livestock that could keep the sponge growth at a moderate level?
Beneficial, most sponges feed off DOC* so will only grow to the extent they have food. A couple species are photosynthetic and as pointed out by A Youg Reefer can overgrow corals. If they bother you and you want to remove them steel straws and a siphon can be used.
*DOC or Dissolved Organic Carbon is released by both corals and algae. Excess DOC can promote pathogenic shifts in coral microbiomes so sponges are essential for removing it.