uh oh

[tgoeujon]

the tank is a 55 gallon, been up and running for approx. a year and a half. sand bed is 4" deep. i change 10 gallons every 2 weeks ( instant ocean). i dose with iodine, coral accel, strontium and molybdenum, purple up, liquid reactor, i stick to dosing instructions on the bottles. i lost a regal tang, yellow tang, 6 line wrasse, 2 chromis, blue devil, yellow damsel, domino damsel, saddled toby puffer, diadiem dottyback, black percula and salarias blenny. parameters are salinity 1.023, ammonia 0, nitrites 0, nitrates 5, ph 8.2, temp 80