I'd never get anything done using this computer I'd be too busy staring at it in wonderment. That dye you added looks the dogs.
You must have a good way to bleed the air, I'm trying to imagine you shaking this whole thing around and turning it upside down lol.
Honestly, it bleeds really well.
Few on and offs of the pumps, regulate the speed, on and off and its pretty good.
Run it for a few hours, on and off again.
Tapping on the rads and blocks and its all good.
And ye I did find myself sitting there just staring at the tubes with the lights off just watching those small bubbles in the top.
Reminds me of a spirit level