Oh bum, didn't realise the picture was so big, sorry...
I would try some activated carbon in a sock and place it in one of those spots.
My tank clouded on Sunday after a water change.. No idea why.
But I added some new carbon to the filter and 2 days later... sparkling clear!
I love the stuff... I know lots of people frown on it.
But it's cheap, effective, and harmless.
I've had issues in the past with cloudiness... and tried not to use carbon.... never again!
Good luck.
I hope you can get it to work for you.