It has been about 10 days, and I am still working on my nutrient problems. I have avoided fluconazol so far, but am still considering it. I am trying to get my nutrients to a better place. I have started dosing neonitro to get some nitrates into the tank. They are in the 3-4 ppm range currently. My phosphate on the other hand is just such an up and down parameter. I try to do the hanna testing process as consistently as I can but the values bounce quite a bit. Here is the graph
Anyway, the algae is making very slow progress. Still doing a weekly clean, but maybe the overall growth has slowed down.
A couple of questions is anyone is following this or happens to read it. The first two pictures are of a Goni taken about 2 weeks apart. It appears to me to be showing some improvement. What have I changed? Well first I have dosed manganese. This seems to be somewhat debated ... some swear by it, others don't think it is necessary. Unfortunately those who dose usually don't give you a formula for how much to dose or how often. I had an ICP test done 2 months ago, and it recommended manganese, but I get the feeling that is disappears from the water so quickly that it rarely shows up on a test. The dosage recommendation from them seemed a little strange, but it was like 0.27 ml once. For a 175 gallon tank, that seems really small, but they are the experts. I have dosed that quantity 3 times now over about a month. I feel both somewhat irresponsible, since it is a parameter that I cannot test for, so I could be overdosing, but in contrast the Goni seems to be doing better. I have also slowly been trying to raise my Alkalinity using Tropic Marin Balling B. Adding about 30 ml a day. Have gone from high 6 to high 7 over the course of 6 weeks or so. Otherwise not much else has really changed other than finally having some nitrates in the tank.
Any feelings on whether the Manganese is ok to dose once a week? Maybe I should send off another ICP test?
A couple of other questions:
1. I do see Alkalinity fall when I don't dose, but I don't really think it is the coral that is largely responsible, because both Calcium and Manganese really don't change much between water changes. I think perhaps it is just CO2 or some other mechanism that is reducing it. I have even heard that GFO can remove it. So when do you really know it is time to start dosing 2 part ... should I be seeing Calcium going down during the week on my Trident?
2. This is a little more complicated, but what do people do to keep mixed reef (SPS and LPS coral) in regard to lighting. I have 4 XR15s and 2 AI Grows. The tank is 2 feet deep. At about 40% power the PAR at just below the surface is around 275-300. At the sand bed, it is typically 100-120, and in the very middle where the SPS would start from I see around 190-200. It just doesn't seem like the variance from top to bottom is very high. So is it a hybrid system of lighting that reduces the variance, or is what I am seeing typical? I mean if I crank them up to help the SPS corals, then the sand bed is going to start to see 150+ which seems very high.
Thanks