I have an echeveria tolucensis and echeveria black prince that I've had since November. They were fine when they arrived but have not established a good root system still. I know they're etiolated and I'd started using a grow lamp on them a month back (they weren't etiolated when they came) but they also haven't been putting out new leaves but are losing their old ones. The tolucensis especially seems to suffer everytime I water it and pretty much overnight had a lot of leaves go yellowish eventhough I didn't give a lot of water. not sure what to do at this point, have just been letting them dry out for 3 weeks now but not seen any improvement. it's my first time with succulents so any help would be appreciated. I live in the UK and there's not a lot of sun or warmth at the moment.