About two weeks ago my football size chaeto started to lighten up and get some bubble algae on it, so I turned off my sump light for about 3 days. The large chaeto ball ended up dying and when I pulled it out it was a soft, slimy nasty mess. Got a new batch from the LFS that lasted about a week before dying off again. A few days ago I posted about the large amounts of kelp looking algae growing on my rocks in the DT and a few people suggested I pick up some emeralds to help. They’ve been eating, but not quickly enough to keep up with growth I’ve since noticed several new patches of dark red powder on the sand and one particularly dark black patch on a corner of a rock (as shown with the green arrow in the picture). My mangroves are just doing whatever.. all of them are turning black from the tops down and look awful, but two are actually growing roots very quickly so we’ll see. Mangroves are about two months old. There is now some bubble algae forming on the refuge walls and lots of short to medium length light brown hair/web growing on the refuge walls and rocks. I’ve been running carbon in my hot magnum canister and GFO and Purigen hanging in the sump in medium flow. About a week ago I also thought it would be a bright idea to put my filter sock with the GFO on my drain pipe so the water coming out would blast the GFO.. hmmm, took me a few days to notice several things starting to turn a burnt orange color. Realized I was probably grinding the GFO and spreading it all around the tank. So I put it back in the medium flow area. I ordered a BRS reactor this morning and will run the GFO and Purigen in there starting Thursday. I also just made the switch from tap water (bring on the lashings) to RO/DI. I have made two 40% water changes and plan on doing at least a total of five over the next couple weeks. I originally attributed some of the extra algae growth to my new ATI, UV and KZ bulbs, but at this point I’m sure I have much bigger underlying problems. My tests from today are below, but I was surprised to see my nitrates so low. They’ve usually been between 20-40ppm and today were barely 5ppm. My P04 has never had a reading higher than .1 even going back to the 1st week of startup. I know that test is horribly inaccurate and can be very misleading though. I thought I’d at least see a comparative difference from time to time. Tank born 2/1/11 46 gal bow, 17gal sump/refuge 50lbs pukani rock 70lbs sand Oceanic salt Livestock - 1 gold coral banded shrimp, 2 cleaner shrimp, 2 emeralds, 4 hermits, reefcleaners CUC (LOTS of snails), 1 green chromie and 1 black and white clown. Coral frags – Favia, Chalice, Frogspawn, Candy Cane, Duncan, ORA green birdsnest and a pink birdsnest. All doing well and looking great. Feeding – I feed Formula 1 & 2 flake, moderate to sparingly. Sinking crab pellets for the shrimp. Maybe once a week a quarter cube of rinsed frozen brine or other mix for the corals and fish, but target fed with a homemade 2’ turkey baster. Will also carefully spot-feed Reef Chili to the coral 1-2 times a week. Lighting – 4xT5HO. 2xblue plus, Fiji purple and super actinic. Actinics run 10 hours/day, daylights run 7 hours. Moonlights off from 1:30am to 6am. Sump light from 10pm-6am. Flow – two Koralia 750’s, 400gph return pump and about 150 from the HOT Magnum canister gives me about 45X flow. Don’t have many dead spots, but the two ends of the tanks are somewhat slow. Reef Angel handles wavemaker duties for the Koralias Zero medications used Temp – 78.7 pH – 8.2 SG – 1.026 KH - 2.4ppm Ca - 450 Mg – 1240 NH4 – 0 N02 - .005 (LFS has tested zero nitrites for 2 months now. My test kit has never given absolute 0) N03 – 5 P04 - .1 Am I missing anything?