African Cichlid DIY auto water change system for 300 gallon tank.

Here is a quick rundown of a DIY inexpensive auto water change system. I made this using a simple garden timer and some hose. Been working for over a year now and tested with a Hanna chlorine test kit. Tap at 5 ppm, water injector is at .001 into the tank! Safe, simple, happy fish. And with a tank this size, it's a must.