Ok ive got a baby hybrid motoro comming in tomorrow i have a nitrate problem its at 40ppm my amonia is at 0.25ppm and nitrite is inbetween 0 and 0.25ppm is the nitrate going to be a major issue for the ray? I expect so.. anyway ive done 2 60% water chnages and a 40% water change over the space of 4 days and hasnt changed at all faulty test kits maybe im not sure freakin out abit as ive had the shop allready hold her for the maximum of a week (policy for fish they order in) and i HAVE to pick her up tomorrow tank is 180gallon with 100 gallon sump with a k1 section amd about 5kg of of ceramic media and the rest is scrubbies and bio balls and a refugium section theres 5 peacock bass in there atm all about 8" ray is 4.5" disc any help would be great p.s. im halfway thru the plywood build for the rays future home 8x4x2.5 so ive planned ahead