Ok. So it worked!
I will post tomorrow some photos on the leak area and how I managed to save it.
Next step now will be to make my own cabinet and to adjust my sump.
The current sump is very small and has a RODI water top-up tank attached. I will remove the glass that separate the sump from this top up tank, so I have a bigger sump.
The cabinet will have to host my sump, a small 8L tank to auto top up, and my chiller. I will also redo the pipes, using check valves and hard pipes to make it neat.
Will post some pics.
Hopefully, I can recycle my tank by next week.