Boomer our Mbu has gotten ill. He was fine 3hrs ago swimming up and down the glass etc ready for breakfast, he had a small mussel and a human prawn, which he ate happily.
Now he is sitting on the bottom, with no fin movement and gone a really strange colour. I can't describe the colour very well but it's very light grey with his normal yellow bits still yellow (please see attached pics)



He is about 5ins long in a planted 120g tank with 2xRena XP3 external filters, a U.V steriliser and an airstone. Cycled for 8 wks, 4 fishless and 4 with fish, he has been in for about 3 wks
Currently running following parameters of.....
Temp 27c/80.5f
Ammonia 0ppm
Nitrite 0ppm
Nitrate <10ppm
PH 8
We have had problems keeping the temp stable the last few days as it has been so hot (varying between 26.8c + 28.3c) it's not a great deal of difference but could it be something to do with this ?
Thanks