Another update...
Yesterday I removed the insanely fast-growing pink/purple/brown zoas, took them to work and traded them for a gorgeous green finger leather... it's turned pinkish in my tank overnight, not sure why. It was sloughing off skin, I blew it off with a turkey baster this morning. No polyps have emerged yet, I hope it's okay.
Something is gorging on calcium, I have no idea what (snails? Corraline?) but it's depleting the Ca faster than I can replace it. I've set up a low-tech (okay, let's be honest here, it's really ghetto) kalk drip - each night I fill a 500ml bottle with kalkwasser (the solution is two tsp/gallon) and drip it into the tank via knotted airline, threaded through a hole in the lid, into the AC filter (area of high current). I've noticed that it seems to stop the skimmer from working.
Two nights of kalk, the KH is fine but still lowish, ~8dKH, but the Ca is still way too low at ~280-300ppm. Everything seems fine, but I can't seem to keep the numbers up! This afternoon I made up a solution of 1 tsp CaCl in 100ml distilled and dripped it in, I'll test the Ca again tomorrow.
I also gave up on the refugium - there was a little rubble that was FULL of detritus, and no matter how I try I can't seem to get any chaeto - someone tried to ship me some, it got lost. I keep asking hobbyists here, and figure I'll get lucky one of these days, but it's scarce up here! Because I've been having tiny NO2 spikes I figure there's not enough bio filtration for the heavy load, so I got an AC70 at work and set it up as a filter, rather than the modded one I've been using. If I have problems with NO3 I'll go back to the fuge - providing I can get my hands on some chaeto.
ATM I'm running carbon in the filter to ensure there are no nasty chemicals in the water from the zoas (some tore open when I moved their rock, they were attached to a neighboring rock and I didn't realize) or the new leather.
Numbers this afternoon:
NO2 0
NO3 0
PO4 0.25 (added some adsorbing resin to the filter)
pH 8.3
KH 8dKH
Ca 280-300ppm
SG 1.024
I've ordered AquaGloves and a refractometer, they should arrive tomorrow or Wednesday - can't wait to see how off my hydrometer is!
The skimmer isn't working - not sure if it's all the changes in water chemistry with the kalk/Ca additions (though adding distilled for topup or CaCl/buffer hasn't caused a problem before). I cleaned out the spray injector, made sure the PH isn't clogged, now I'm just going to hope it kicks in overnight - the tank is FULL of bubbles, it's not a pretty sight!
Here are some pics from tonight -
FTS:
The new leather: