cryptic sponges

Whalehead9

New member
I want to add a cryptic zone to an existing system, and was wondering if anyone has tried cryptic sponges , that can be purchased online?
 
I always have a lot of them that came in on my rock, and feed phyto occasionally to encourage them. I think it would be a great idea for a club meet to bring a ziplock of tiny sponge bits off the varied sponges in your tank and trade about. I have white, yellow, blue, and maybe red---not sure what that growth is.
 
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