Hi Penny

Looks like it is likely colonised with candida. Can try some anti fungal treatment but unlikely to resolve.

Tend to find candida colonisation is more common in jejunal tubes than gastric tubes and the Monarch tube is silicone so the candida tends to infiltrate the tube.

I would be tempted to attempt tube replacement. Ideally give a 1-2 week course of anti fungal treatment and replace tube half way through course. It’s not urgent if the tube is still usable but you wouldn’t want to leave it too long as the tube can become stretchy and don’t want to risk it snapping when traction removing.

Best wishes

Charlie