Hi - I've used flatish rocks/slate piled up to about 6 inches high, pea gravel piled around, leaving the rest of the water area with a clear bottom. The water is 5 inches high.
Then I've squashed bits of moss into the 'joins' so to speak & this appears to be growing (hooray).
The toads seem to like it, and the moss helps them to climb up a level. Its easy to cope with too.
Hope this helps.





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