And how are you keeping it at bay ? Doing what I’m doing taking the rock out and moving coral around or do you have a angel ?
Never.
Just let it do it's thing.
Do you think I could get a angel small and give it up when he gets large . The smaller ones don’t eat sponge ?
I had a coral beauty for about 8 years.
Mean sob-but never touched any coral.
He would pick at the sponges, but I can't say for certain he ate any.
I did notice while using reef crystals, the sponge took off. Don't know if there was anything more it liked in the salt or what, just an observation.
Mine also only grows on certain types of rock, mostly on/in my oldest rock, which is 25 years old or more. I've added a few pieces of dry rock,rock from just off the shelf over the years and it's not on those.
As far as I know, and this is from all my years although I'm not quite as with it today as I was, all the larger angels will eat sponges.
Like Tim said, maybe not yours.
But, all of these angels can destroy a home reef in a matter of days.
Or they may not.
The Rock Beauty, one of the most beautiful yet most impossible to keep feeds directly on sponges and almost nothing else.
I have not the experience or expertise to comment on which sponges any angels prefer over others.
I've had many large angels throughout the years.
I love them and would keep them all if I had the chance, or had a larger tank.
If interested in an angel for a 75g, something like the African Flameback is a Pygmy and a fun little guy, mean as all get out or a half black, which are very docile with a great personality and also are great rock pickers, great for an established tank.
Just remember all angels, no matter what size, will use 100% of your tank and most if not all are moderately aggressive and cannot tolerate another angel or things their same shape.