A few days after I added a blueline trigger and clown trigger (also had a cinammon clown and a blue damsel) to my 90 gallon FOWLR which has a protein skimmer and sump with bio balls. When i got home last night from a friends house, i noticed that my fish were in bad condition (pale and non-receptive). I immediately transferred 5 gallons of water from my other saltwater tank and put it in a clean 5 gallon bucket and transferred the fish into the clean water and have an aerator pumping oxygen in it. The fish are doing alright in there. After running a water test, I found that my nitrite level is @ .25 (API testkit). I did a 30% water change and let the water filter in the tank for a while. The nitrite level still appears to be at about the same spot (although the bottom quarter of the test tube that i put the test solution is light blue indicating 0 nitrite, and the top three quarters of the test tube are purple indicating .25 nitrite). I would be grateful if anyone had some advice on what to do. I'm nervous about putting the fish back in the tank since there is nitrite present. Any and all help would be greatly appreciated...the LFS in town is currently closed.
Thanks in advance,