Does carbon bleach your corals ? (Kent carbon recall)

[Casey8]

Damn it, I even didn't have a small amount of that bad carbon
Thanks Daniella, I will reduce the lights for a few weeks. What is a polyfilter ? I have never heard of it before. Anyway, I'll call LFS and find out about it. I have more than 1/3 of completely white bleached corals in my tank. I still don't know what to do with them yet. Throw them away or wait to see if they come back ? Hmmmm ... good luck ? The rest of the corals are totally faded, only me the owner can recognize what were the original colors before, even my husband totally got lost has no clue. I am really &^%$# off with the Kent product. I will never buy anything that is made from this company again.

[daniella3d]

Not possible in my case because i put the carbon in the evening where there was just the actinic T5 on, then when I woke up the light was not even on yet, but I could see something was wrong. EAch morning when I wake up the first thing I do is to check my aquariums.

It must be something else. I do not beleive that 8 hours of Kent carbon could have stripped so much from my water than corals were dying. I used carbon on regular basis since the beginning of that tank, but was using Seachem.

I beleive that something far more serious hapened here with some batch of Kent carbon. It could be some heavy metal, as I don't think that carbon can absorb copper or other toxic metal so it could have leached something like that. I just got my water analysed for heavy metal 3 weeks ago and it was perfect. I will have it check again just to be on the safe side.

When I saw this I immeditaly removed the carbon and did a 30% water change. That was the only thing I had done to the tank so it was the first thing I removed.

Originally Posted by jjntm

My buddy rob We believe it is just that the carbon stripped the water too clean and allowed excessive light penetration which bleached the corals