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I would use a syringe and h2o2. That way you can get the h2o2 right onto/into the sponge without getting any on the coral flesh.
Thanks for the reply. Would I need to be concerned with the sponge dying in the tank from injecting it with hydrogen peroxide and causing any issues? That's why I thought scraping might be better,but more difficult to get it all removed. I couldn't recall if it was an octo or frog. Here's an older video when I first got it and an older photo (orange filter).I would use a syringe and h2o2. That way you can get the h2o2 right onto/into the sponge without getting any on the coral flesh.
(By the way, I don't believe that's an octo. Looks like a frogspawn)
I ended up trying to scrape some off and h2o2 other parts. It was not easy with how tight the heads are.Funny! Dealing with the same thing (wrote about the same time too!). So far, it’s been harmless.
@EeyoreIsMySpiritAnimal sent me over. That’s a beautiful frogspawn; love how the color gradients. I’ve pretty much ignored the sponge the last 2 years. If I end up fragging pieces off though, I may end up just cleaning it with a razor and/or diluted 3% H2O2 (outside the tank).