Hi for me i don't grow in water trays, only in well drained pots or tubs, found in my grow area they don't do well in to much water ,seems to like it a bit dryer medium ,not sure if it will work for you ,may be worth a try ?
Seems to like it a bit dryer medium ,not sure if it will work for you ,may be worth a try ? here is a tub of mixed untric's , longifolia doing well for winter here , usually die back hard in winter and come back in spring tub dose not hold any water ,all drains out.