black stuff growing on the edge of my monti cap

[AJ_77]

If it's a new frag you could be having some die-off from the stress of moving, acclimating, etc. A couple I had turned white on the edge and then grew some algae for a while, then it cleared up. The frag got healthy and grew over the bad patch.

But my experience with Caps is quite limited - seems if they have half a chance they should be OK.