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t1a1c1h · 10/22/2017, 09:06 AM

We currently have 6 acan colonies of varying sizes. Until a couple of weeks ago we had 3 more but they have all dies, and now some of the remaining colonies are starting to show the same symptoms. It starts with the heads not fully expanding, then progresses rapidly to a stage where each head/polyp has shrunk down to a tiny size in the middle of the 'cup' of skeleton on which they normally sit, then they die. It usually starts with one head and spreads rapidly over a few days to the whole coral. We tried to frag one which was suffering badly but it died regardless. Some of the colonies have algae growing around the edges leftover from a crazy bloom a couple of months ago when a well-meaning relative overfed the tank while we were on holiday. None of the colonies are new, we've not added any new fish/rock/inverts/corals for months. Tank has been running for about 18 months. We did a rescape recently and have since had a pH drop - initially down to 7.4, now at 7.7. Params are alk 180, Ca 500, Mg 1500, NO3 30, PO4 0, NH3 0. Yes the Mg/Ca and alk are high but they are ALWAYS like this. NO3 is usually 5 - don't know why its spiking. Lights are AI primes. Tank is 90G mixed reef set up with SPS, LPS and softies.

10/22/2017, 09:06 AM	#1
t1a1c1h Registered Member Join Date: Jan 2016 Location: Birmingham Posts: 31	Acans all dying We currently have 6 acan colonies of varying sizes. Until a couple of weeks ago we had 3 more but they have all dies, and now some of the remaining colonies are starting to show the same symptoms. It starts with the heads not fully expanding, then progresses rapidly to a stage where each head/polyp has shrunk down to a tiny size in the middle of the 'cup' of skeleton on which they normally sit, then they die. It usually starts with one head and spreads rapidly over a few days to the whole coral. We tried to frag one which was suffering badly but it died regardless. Some of the colonies have algae growing around the edges leftover from a crazy bloom a couple of months ago when a well-meaning relative overfed the tank while we were on holiday. None of the colonies are new, we've not added any new fish/rock/inverts/corals for months. Tank has been running for about 18 months. We did a rescape recently and have since had a pH drop - initially down to 7.4, now at 7.7. Params are alk 180, Ca 500, Mg 1500, NO3 30, PO4 0, NH3 0. Yes the Mg/Ca and alk are high but they are ALWAYS like this. NO3 is usually 5 - don't know why its spiking. Lights are AI primes. Tank is 90G mixed reef set up with SPS, LPS and softies.