Hello everyone. Well it's been quite a while since I posted. There has been a lot of progress and also some drama with the tank.
The fish have been doing very well. Since my last post I've added an achilles tang and a mustard tang, as well as a bunch of little gobies and anthias. The achilles had a small bout of ich initially, but was eventually able to fight it off after a month or so. I had him eating flakes and pellets on day two and now readily accepts all forms of food. He's been in the tank about 2 months and I would consider him fully acclimated.
On the invertebrate side of the tank I've had a few issues. First, I set up my dosing pumps to dose the two part calcium and alkalinity supplements. I prefer this method because it requires less effort. I calculated out my dosing amount, but I forgot that the profilux doser defaults at three separate additions per day. So essentially I was dosing three times the necessary calcium and alkalinity. I noticed after about a week when the livestock started to show stress. The monti caps started to bleach over night and the sps lost colour and began a slow tissue necrosis. When I checked my calcium and hardness, my calcium was in the 700s and KH was around 18. It took quite a few water changes to bring the parameters back down. I now sit at 460 calcium and 10 KH. I was able to save a number of the sps by cutting off the areas of STN. They are currently on the rebound. This was pure stupidity on my part.
For the last month I've been dealing with low pH issues. Daytime pH was around 7.8 and night time dropped to 7.5. My 1st thought was it could be the calcium reactor, so I turn it off. After a week the pH was unchanged. I started thinking about the CO2 levels in my house. I purchased a CO2 meter and my levels are around 600 which is twice the normal outside levels, but still within normal limits for indoors in the winter. After a process of elimination I narrowed my focus to the biopellet reactors.
A few weeks ago I noticed my nitrates creeping up. The were getting close to 20ppm. I decided to combat it by increasing my biopellet use. I purchased two large biopellet reactors that could handle more flow and hold more pellets. They are made by Next Reef and don't contain any sponges to get clogged. I set up two XL reactors and filled each with 1L of biopellets. After about 3 weeks, the tanks nitrates and phosphates were undetectable.
In response to the low pH I tested the reactors effluent at only just slightly lower than the tank water. I decided to remove one reactor and see what happened. Daytime pH rose to about 8.0 and Night time to 7.8. I added Kalk to my top off water and am now able to maintain a nighttime pH of 8.05 and daytime of 8.25. I've been monitoring my nitrate and phosphate levels over the past week and they are still undetectable.
I was under the impression that you couldn't overdose biopellets, but apparently you can. It would seem to me bacteria would only be able to ferment the sugars if there was available nitrate and phosphate. Once those levels dropped below a certain point, bacterial fementation would cease. This is clearly not the case. I checked internet resources on the subject, but there is little to no info on this. All the manufacturers say is to direct the effluent to your skimmers.
I've been able to establish some stability again, and the livestock seem to be recovering. I still don't have all the colour that I had, but I'm confident it will gradually return over the next few weeks.
I've changed some of the aquascaping to provide more surface area to attach corals to. Unfortunately I was unable to take advantage of all the great boxing day deals we had at LFS due to the problems with my dosing. I have however taken advantage of other hobbyists breaking down there tanks. I've purchased a lot of home grown corals to cheat and give my tank a more mature look. Plus the corals area hardier in general which I needed with the recent instability of the tank.
Here are some current photos.