Pics don't show it as I was just trying to show the surface. But these rocks make amazing caves/overhangs. However it's certainly not reef rock. THe larger one on right when a bit of the tip snapped off was fairly granular on the inside, but on surface you can see is completely pockmarked in kinda bubble shapes, though not very porous.
The one i was a bit more concerned about was one on left, so dark it's almost black, on back side it also has brown marks, unsure if residual life or possibly rust almost? Both are pretty heavy/dense. I have plenty of filtration surface area otherwise. THese were from someone elses tank, and I had them for a while in my 210. I was fighting some issues before I had to breakdown for move. (Random corals not doing well, but others fine, and my lions both passed 1-2 months apart) But I put that down to more bad parameters I let build up working 80hrs/week and then shocking things with too much GFO. Now I wonder a little....
Any good way to test the rocks for bad stuff or get a better idea? I've already poured some bleach on them, followed by a spray down and let sit with vinegar before soaking in RO to clean off.
The one i was a bit more concerned about was one on left, so dark it's almost black, on back side it also has brown marks, unsure if residual life or possibly rust almost? Both are pretty heavy/dense. I have plenty of filtration surface area otherwise. THese were from someone elses tank, and I had them for a while in my 210. I was fighting some issues before I had to breakdown for move. (Random corals not doing well, but others fine, and my lions both passed 1-2 months apart) But I put that down to more bad parameters I let build up working 80hrs/week and then shocking things with too much GFO. Now I wonder a little....
Any good way to test the rocks for bad stuff or get a better idea? I've already poured some bleach on them, followed by a spray down and let sit with vinegar before soaking in RO to clean off.