We had first go at putting aloe plants outside (mid Scotland Uk) under
plastic in begining of april but found the leaves going a sick yellow . have
saved the lot by fostering them out to family members window sills and all
but one have returned to vibrant green.
Compost was normal
slug damage high
weather has been good/ warm since behind glass
poly tunnel was a 450mm high medium sized type

Enlightendment needed, .. even ideas on what might be wrong

thanks in advance