So I have a 75 gallon tank with another roughly 40 gallons in the sump and fuge. My tank recently went basically fallow for two years with nothing but a few corals plugs and two clownfish. Recently ive been getting back into it and have been doing 15 gallon water changes with tropic marins classic salt every two weeks for about 3 months now. I got my water tested at two pet stores located an hour away and some parameters matched, others didnt about 3 weeks ago. One thing they both read was unreadably low phosphate and nitrate (as well as nitrite and ammonia). Currently I can test for Ca 450 (was much lower been raising for 3 weeks), alkalinity reads between 8.75 and 9.3, and magnesium 1275 (bit low). I know I have to raise the nitrates and phosphates; the plan was to overfeed. I have been doing so for 3 weeks and I have psammi, a scoli, blasto, cyphastea, and Duncan growing reasonably well even when the tank was fallow. New frags include a monti cap, tiny torch, palygyra, acan, war coral, and another cyphastrea and they were all doing great for a few weeks. This morning the monti cap has considerable skeleton showing. I have it placed in higher flow and near the very top of my rockscape. Maxspects r200 LED are lighting. I’m assuming the problem is the low phosphates or nitrates, but like the name says I’m a bit of a noob. Does that seem to sound right? How long would over feeding with rods food take to raise the nitrates from nothing to something like 5 or 10? I know there’s lots of variables but I’m trying to figure out if I should buy something to dose (is so what? I’m relatively broke… two kids in two travel sports each) because over feeding alone is too slow. I did lose one of the new fish, a 2.5-3” mandarin fish that I cannot find and remove… so it’s possible the ammonia is spiking? I run a huge reef octopus, filter socks, and a 25 gallon fuge. I plan to test nitrates when I get home today and realize my overall testing leaves much to be desired. That said I’d appreciate any theories, advice, or spitballed ideas! Thanks a ton Phil.