Quick mid maintenance cycle update...
Alk holding steady at 7.8dKH @ 4.1ml dose a day. Switched to new reagent for the Hana alk tester and it was 0.1dKH low when we did a comparison before our last vial ran out. I upped the dose to 4.25ml a day to see if we can get it back up closer to 8.0dKH.
The vibrant is still on 2.5ml a day dose. I haven't seen any progress with the ulva, actually quite the opposite, but the skimmer cup was GREEN today. Like huge green flakes in the cup green.
ATI ICP results are back for the test we sent off one Feb 13. Most major elements are in line, trace are all but depleted and we have a few things elevated. Particularly sulphur. Not sure where that could be coming from. May be a dirty sand bed. Next maintenance day I'm going to siphon it really well and get any detritus out of the dead spots in the back of the tank. Nutrients are bottomed out. I cant detect any with my kits and ATI is showing .01 and .02 ppm NO3 and PO4.
With the trace elements depleted, and the nutrients all but bottomed out, I decided to toss the chaeto. Yep, I shut down my refugium. It was too effective, and out competeing corals for the good stuff. The vibrant might have killed it off anyway, and I'm not going to put it back in after eventually clearing up the ulva and not treating the chaeto also. I've been tossing around the idea of a cryptic zone and I think that's which way I'm leaning right now. I'm going to downsize skimmers to the Curve 3.5 but I have to trim some acrylic to get it to fit in the front of the sump, then the large chamber will be a dedicated cryptic zone. I'll put some mud down, and add some live rock for some structure, then look into seeding some sponges for filtration. Also KZ has a product to dose for sponge growth. Eventually I'd like to run sockless with this set up, little to no carbon and no GFO.
https://lab.atiaquaristik.com/timeline/14850