Hey Guys!
Thanks very much for taking the time to answer. After re reading my initial query, I award myself a swift kick in the pants for not checking for typos... Yup... it should have read 29.5, up 1.5 from where I had it set. Please excuse a two finger keyboarder!
I will tweak the temp to 30C in favour of the juvenile discus, and introduce rock salt as well. (checked again the internet for recommended salt dose). Daily water changes have been implemented, and the carbon was removed from the filter the other day. Again, thanks for your input! fingers crossed!