Sorry for my lack of activity..I shall do my best to fill you guys in on the last few months.
Between January and April I was forced to work approx 150 hours per week. I had staff absences and illnesses and it is an extremely busy time for us when we are fully staffed.
As you can imagine working that much takes its toll and the tank was somewhat neglected.
Nothing was really happening with the tank anyways, most of the coral stock was wiped out with the great salinity incident of late 2013. The tank was young and hair algae reared its head and took over so in some ways i was grateful that work kept me away for 3 months.
I periodically swapped out the rowa and took care of pressing issues with the tank but on the whole it had to fend for itself with one frozen food feed per day and auto feeders feeding flakes and pellets.
A couple of weeks ago work eased up and I was able to actually sit infront of the tank and take stock of how it was performing.
Nitrates were at 3...alk hadnt altered and was a steady 9...p04 was 0.2...calc 420, mag 1440. I was pleasantly surprised if im honest.
During my absence I had to turn the skimmer off. One of the pumps was tripping the electrics and I just didnt have time to investigate further so those figures were with the tank running without a skimmer.
Also while I was busy with work one of the 1kw bulbs blew. I ordered a new one but had to wait as they are not considered stock items by anyone. I ordered the same kelvin but it was a different brand than I had been using.
When it arrived I simply installed it and went back to work. When I eventually got to see the bulb in action I soon realised my mistake. The different brand bulb was a very different colour rendition for the same kelvin and it was waay more powerful. What few corals I had that had survived the great salinity incident were fried by the new light.
I ordered two new blv 20k bulbs and waited for them to arrive.
It transpired that one of the skimmer pumps had a fault in the resin block. It was allowing water to come in contact with the electric feed…new skimmer recirc pump ordered and fitted now.
The new bulbs arrived and are now on the tank…but they came with their own issues. A couple of weeks ago I started to add a couple of colonies to the tank. All was well for a week but then the coral tips would die. No stn or rtn just white tips. The alk is very stable and is currently tested for twice a day using hanna checker. 8am it is 152 (8.664dkh) and 11pm it is 153 (8.721dkh) with such a large body of water all the elements are stable. I wondered if I had a contaminant of some kind and so began running carbon to see if that would help but coralline is growing well and other corals are un effected. I had loaned out my par meter and waited for its return so I could check the new blv bulbs.
When I finally got around to checking the bulbs I was very surprised to find that the new blv bulbs were 2x more powerful than the previous brand used. I was getting 350 par on the sand bed 5ft away from the lights. The couple of test colonies added were purchased from a LFS with 200/250 par and I thought I was placing them in around the same light based on the initial par readings. As it turned out I was adding them straight in at 600+ par!!...that’ll be why the tips were burning. Add to this now the skimmer is running I have 0 ppb phosphorous and very low nitrates. There are still a few algae spots in the tank so I know the phosphate reading is skewed somewhat but with such low nutrients you cant bake the corals.
So that’s where I am now. On weds I bought 23 colonies and they were dipped and rested in the frag tank for a couple of days. Yesterday I added them to the tank on the sand bed. I have raised the lights 6” and have reduced the light period down to 5 hours. Elevating the lights now means I get around 200 on the sand bed so I will have to see how the new colonies do. I am also trying to raise the nutrients with heavy feeds and I have turned off the phosphate reactor. If I continue to get stripped tips I will have to have a rethink, I don’t know what else it could be.
Some pics for you…as ever I apologise for my serious lack of photography skills.