well have looked at a couple of online shops and they all seem to have there tanks at 6.5 but as above probably for breeding requirements.
also what is your opinion of croaking gourami in with them, i've read gourami should be avoided I'm just getting some and can't decided which tank they should go to. is this fact true or is it just another peice of rubbish i've picked up?
You have to be careful with Gourami. I know smaller species can be alright, but you need to watch out for tank temperature too. Discus need a temperature of at least 28C. I have had a little Honey Gourami in my Discus tank for about a year now and he is doing well, but I have heard they can handle higher temperatures.