Pale, Marked leaves on paph

[wahaj]

Hiya,

I'm at work right now so can't post a picture but will try to do it tonight.

Basically I have 3 paphs, a couple of them Leeanums, and another similar hybrid. When I bought them, they had mid green, floppy leaves. Last year they were in good light and watering was erratic, however they developed some mid-dark ish green leaves . I've now moved to a new flat and the existing leaves seem to be loosing colour. I'd slowly moved them into an area of light, but there's no direct sun, and because of the amount of plants around them, they're always shaded.

It's difficult to describe how they look. It's like they're almost losing water as they feel rough in texture, and they seem to have a network of dark green veins all over the pale coloured leaves.

There is new growth on all them and it seems healthy and vigorous to me. It is however lighter in colour to last year's growth.

I'm assuming this is an issue with light.

The humidity around them seems to be constantly between about 80-90%, sometimes higher.

I've only started to feed them this year with a very very weak solution seaweed fertiliser.

I always water them with rain water.

Unfortunately one of aparatus I'm looking to buy next is a min/max thermometer, so I can't really comment accurately on the temp ranges they're growing in, however it's always roughly room temperature and I don't have the radiator on at any time, it's just a naturally warm flat.

Help!