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Hi- I have a 55 gallon Aqueon tank stocked with 6 Rainbow fish, 2 gold weather Loaches, 4 Cory Catfish. This tank has been running for about 3 years and it has now crashed, I believe with old tank syndrome. I do water testing everyday and water changes, around 15% sometimes more. The testing today came up with: PH. 6.0, ammonia. 0.25, nitrite 0.25 ppm, nitrate 40 ppm. These are the usual values I’ve been having for around 2 weeks- not sure what to do!