I've been running my tank off of testing strips and when i found out they're ineffective i went out and bought an ammonia testing kit, and a few others. My ammonia is 2ppm. I did a 20% water change second day of siphoning the gravel and it goes down for a bit and comes back up. I am currently feeding them every few days. And keeping it to a minimum because i know that can become a problem is overfeeding. If someone could help that would be great