Over the last week, we've run into an issue with our aquarium where our fish and coral rapidly declined. We have a 55 gal
tank, that has been up and running for 4 months now. Last week we had 2 clown fish, a valentini puffer, an adorned wrasse, 2 emerald crabs, 9 hermits, various snails and a sand sifting seastar. We also have various coral, about 10 LPS
frags (hammers/frogspawn/bubbles/duncans) and 2 colt coral.
The sequence of events goes as follows:
Friday, June 9th
: Everything looked great, I actually commented on how well everything was looking (possible downfall number 1). We added SeaChem fusion 1/2 to raise the alkalinity/calcium.
Sunday, June 10th
: Everything looked good, added calcium to bring it up slightly, topped off tank with saltwater.
Wednesday, June 14th
: A few of the coral were throwing a fit about where they were at, but everything looked good. Preformed a water change like we typically do, 5 gallons.
Thursday, June 15th
: We were missing our small Maroon Clown, figured he was just hiding. Later that night we found that one of our Emerald Crabs was eating him. At this point we figured that maybe the Emerald crab caught him and decided to eat him. At this point, all of our LPS
coral were closing up. Some began to show skeletons.
Friday, June 16th
: We noticed that our larger clown was not looking well, he was swimming at the bottom of the tank, resting on the sand. Later that night we pulled him from the claws of our Emerald Crab. Our LPS
coral were completely in, showing more skeleton. Colt Coral look fine, and actually keep breaking off branches and regrowing (went from 2 to 4 colt coral frags in a week).
Saturday, June 17th
: We added some chemiclean to our tank to remove some red cyano
that had taken over our tank. At the same time we noticed our puffer was looking the same as our large Clown did, swimming/resting on the bottom. We thought this may have been due to the new wave makers we got (went from smaller ones to larger ones for more flow) we had them pointed at the rocks to blow the cyano
off the rocks. We later found the puffer dead and our wrasse on the bottom resting. We were able to get the wrasse up and swimming and he looked fine. We did another 5 gallon water change, as most of our LPS
frags were complete skeletons at this point, with barely any tentacle showing . We did an iodine dip on them, which didn't seem to help.
Sunday, June 18th
: So here we are today, I just got done flushing my wrasse and doing a 10 gallon water change. Our crabs look fine, both hermit and emerald. Our snails are active, and our sand sifter is sifting away just fine. Our coral are still completely in, we have attempted to feed them mysis, but with them completely in it is hard to do. Colt Coral are waving away, having a great time.
Our current levels are as follows:
Ammonia: 0 ppm
Nitrite: 0 ppm
Nitrate: 20 ppm
Salinity: 1.023 SG
pH: 8 pH
Calcium: 440 ppm
Alkalinity: 180 ppm
Phosphate: <.1 ppm
At this point we're not sure what caused this purge of most of our tank. Nothing has really changed, we removed the red cyano
and added new pumps to help prevent it in the future. Any suggestions would be greatly appreciated.