Thanks guys,

I am just on the outskirts of edinburgh and the water is very soft, though i donbt currently have a water hardness test.

The tests i do have came out as follows on the tap water,

PH- 7
Nitrite - 0 ppm
Nitrate - 0 ppm
Ammonia - 0ppm

I stupidly just spent £60 on a water filter whish says it will deionize the water and it comes with a mineral mix to add to new water. Says its tested by some guy called Jack Wattley who is meant to be some top breeder.
I hope i didnt just waste all my money, lol. I can always take it back, but cannot find a shop that sells hma filter, only online.

I assume using the hma filter or ro filter is essential with discus? even with tap water that tests like that??