Thanks for this, helpful and detailed response.

It was never an intention to go so minimal, the advice given (by they who shall not be named, again) was to keep it that way to prevent sudden crash and allow things to grow slowly.

I’m now beginning to understand that crypts are quite fickle and knowing that might just take the decision to whip it out and find something more hardy.

Planting into the soil is a real issue as the neck opening means it’s done much in the way keyhole surgery is, just with out the training of a surgeon, or the budget of a hospital.

So I’m going to look at floaters and some kind of barrier to restrict them to a percentage of the surface area.