Did a water 25% water change yesterday notice within testing the water I found my Nitrate is at 160ppm, ammonia is 0 ppm, phoshate is 0.5 ppm nitrite is 0 ppm and carbonate is 107.4 ppm. Now I only have fish only in the tank and they are 6 small damsels house in a 90 gal bow font. How can i fix...