My tank is 200l. We did our weekly water change of 25l on Tue night. These were the parameters last night: sg 1.024, nitrite 0, nitrate <2 mg/l, ammonia <0.01, ph 8.2, kh 9.5, calcium 420, phosphate <0.03 (a tiny tint so not 0), magnesium 1380. I've had the wrasse for 2 weeks and am really...