Saw this round mass on the bottom of a rock in my sump. It’s about half the size of a golf ball. Any ideas what it is? Friend or foe?
Looks like a sponge. If it is then it’s nothing to worry about. I have all kinds of sponges hiding in the dark places of my sump and under rocks in the display.
Sponges come in many shapes and colors. Some are photosynthetic (needing light) but most are not.
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Yep it’s a sponge. Very friendly friend.
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