Carpenter, the more I think about it, there's too many variables to blame the nitrate only, but that is still my main suspect. The MH's where 250 watt, tank was 45g tall, however, this was when canister filters where the rage, no dsb- crushed coral. This was mid 80's when I tried it, but I do remember the nitrates being in the .25 range (that is why I suspect it). Turned me off to trying to keep anemones again, now I do want to try mushrooms (I know, they are technically anemones too, but this is a completely different system that I have more faith in).