#discus

I have a 50 gallon tank with 4 discus in the tank. My levels are almost perfect. I have no ammonia or nitrite, low levels of nitrate (b/c there are plants in the tank), 0 KH, and 6.8 ph. However, my general hardness is super high. I have tried everything. I have peat moss media in my filter...

I have heard a lot of different things regarding how big of a tank is required. I have a 29 gallon tank, which according to the internet I should be able to fit 2-3 full grown ones (it says 1 per 10 gallons). However I have been told there is a minimum of a 55 gallon for one and then 10 gallons...