They are growing from some of my frag plugs. In the one picture, the frag plug is totally over taken by whatever it is. You cannot see the plug anymore. They have been in my system for about 2 months now. This just started growing within the last week.
I second the sponge. If you can pull it apart real easy and it's soft and squishy it probably is. I get a similar looking sponge in my tank occasionally. And for some reason they do like to grow on the bottom of frag plugs
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