Sump Sponges

PRC

Stop Quoting Me!
So I've been aquascaping my tank for 2 straight days. (I'm afraid it's still gonna suck)...But I built a PVC support frame to hold all of the rock, I've been cutting, drilling, and attaching rock to pipe for 2 days. (Should be done tomorrow) I'll upload pics.

Anyway, needed some small pieces of rock so I started rummaging around in my sump for some of the rubble rock that I have in it...The thing is FULL of sponges. Almost the entire bottom of the middle section of my sump (12") is completely full. I can't really see in there very good, so i was just reaching around and I felt some squishy, started investigating SPONGES everywhere. Red ones, white ones..everywhere.

I'm not worried about it, but is that normal?
 
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