Thanks for reply,

I water about 500ml every 2 days, they are about 2.5 foot high and good foilage, too much? hope not as I gave them 1litre each tonight hoping it was underwaterred, being honest I am unsure when they need water as I only test by poking finger down and it is always dry every 2nd day, even the clear trays that are only 3inch deep get bone dry before I give the 500ml.

Would like to repot but that would mean cutting off huge root system that developed in trays underneath, that a bad thing?

Thanks Paul