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The bleaching is on the exterior. I did cut a piece off and it decay hasn’t affected the interior that I noticed.I can’t tell from the picture if deterioration is surface or internal. Yes, red tree sponges are difficult to recover once they start deteriorating.
I have better success with yellow ball and orange elephant ear. I have had limited success with using a toothbrush with surface algae
Not sure about fragging it, however, I have pruned and discarded deteriorating branches.
TouchéMine have done way better in my sump. Not sure if they like the darkness, or the absence of angelfish eating them helps. Probably both. My lemonpeel angel LOVES sponges so I kind of gave up on having them in the DT.
But it is much harder to enjoy them in the sump.
Yeah, and I can't have a tank without angels so.... Choices were made.I removed all tangs & drawf angels because both enjoy sponges.

Yellow ball sponges are hardyThe bleaching is on the exterior. I did cut a piece off and it decay hasn’t affected the interior that I noticed.
This is for my macro tank and I’m looking forward to acquiring other colors as well.
That’s why I’m making a macro tank. I have 2 tangs that destroy macro.Mine have done way better in my sump. Not sure if they like the darkness, or the absence of angelfish eating them helps. Probably both. My lemonpeel angel LOVES sponges so I kind of gave up on having them in the DT.
But it is much harder to enjoy them in the sump.
Aw dang. A new place to shop….Yellow ball sponges are hardyThe bleaching is on the exterior. I did cut a piece off and it decay hasn’t affected the interior that I noticed.
This is for my macro tank and I’m looking forward to acquiring other colors as well.
https://mosaicmacros.com/products/ball-sponge-agelas-clathrodes?_pos=2&_sid=f5e60f038&_ss=r
As well Orange elephant ear sponge
https://mosaicmacros.com/products/elephant-ear-sponge-agelas-clathrodes?_pos=9&_sid=f5e60f038&_ss=r

That’s why I’m making a macro tank. I have 2 tangs that destroy macro.