New to the Forum - question about fertilizers/nitrates?
I've been reading the forums for a while, but this is my first post. I recently had an issue I was hoping someone might be able to help me with. I just started EI dosing on my well established tank 2 nights ago, and yesterday I came home to 5 or 6 dead Tetras and the rest of my fish were all struggling at the top of the surface. I unplugged my C02, and did a nitrate test, and then a 50% WC. The nitrates were really high, somewhere around 40-80 ppm (they're usually less than 10; I tested my tap water, it's less than 5). Everything else in my API test kit was normal. The fish seemed to recover after that, but I have no idea what happened. When I did the first dose, I did 1/2 tsp KNO3 dry, 1/8 tsp KH2PO4 dry, and 1/8 tsp Seachem Flourish right after I did a 50% WC. I got the ferts from a reputable LFS that specializes in planted tanks. I also brought home 5 new tetras, put some new amazon swords in, and installed a pre-filter sponge at the same time. Here are my tank specifics:
45 gallon tall (36x12x24) - medium planted, medium stocked with fish
Finnex Fugeray Planted+ light 8 hrs/day
Ehiem canister filter
Pressurized CO2 with a regulator from GLA 8 hrs/day. I run it at 1-2 BPS, and it has been steady with no issues for about 4 or 5 months. Drop checker was a light green (maybe slightly lighter than normal), but nothing seemed to be out of the ordinary with it.
Any insight would be greatly appreciated! My first thought was that I had to have screwed up the KNO3 dose, but I double checked the doses with a couple different sources, so I'm really stumped.