Hi, I am getting a total ammonia reading of 0.25-0.5 from my AP or SC kit. The SC shows free ammonia of 0.01-0.05. I am getting this reading from brand new RO/Distilled water after I add the salt mix. I was using Coralife but switched to Instant O, same result. The salt is mixing for 4 days, temp 76-78 w/airstones. I have been doing 20gl/1 wk because I thought I had an ammonia problem. The readings are the same in the tank. 90gl FOwLR 14 weeks old, nitrite 0.0 nitrate 0 ph 8.3 sal 10.023 temp 78-80 p04 0.25. I only have 4 small fish, 2 stars, crabs, snails & feed sparingly.