To mount or pot Cat Loddigessii and Harrisoniae

[Potluck]

I am from South Africa and have bought one of each (mounted) about three years ago. Both have suddenly slowed in their growth and have become shrively like they are desiccated, although both have spindly new growths, but they show no new roots.

All my other mounted cats are doing well, and they have not been disturbed or anything, so I am concerned. I am considering taking them off the mounts and potting them once the new roots appear. Is this a wise move, or should I try something else.

They receive about 14 hours of strong light. I water and feed daily due to our high day temperatures in summer (between 28 70 36 degrees C) with a quarter strength mix alternating between seaweed extract and a balanced NPK fertilizer, alternating. I supplement with calsium sulphate, magnesium sulphate and iron chelate in very weak quantities.

Any advice will be appreciated.

I am hoping they will last until I can repot them into a medium bark medium for want of anything else to do.