Thanks Amanda! I can see that if the rain is not on for a couple of days, when I put it on, they came out straight away under the rain! So I think they like it too!

regarding the background, I used "Crommelin Pond Sealer - Black" (Pond Sealer Colours: Waterproofing: Crommelin) but I think you won't find that in US. You might have to do a research on what fish-safe pond sealer you can find there. This one came in 3 colours, black, clear and sandstone.

The coco peat that goes on top of it doesn't always stick, so I thought that black would be better as the expanding foam was already a bit yellowish and I wanted this to look rather dark in the places where the coco peat came off.

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Kristen, Thanks for your comments This time I think I will enjoy it like this for a while until they grow. At that stage I think I might have to go a bit more minimalistic in the design as I heard that the GTFs get a bit destructive :-p
By the way, I've been meaning to ask you for a while but I always forget. What does the coding on your signature stand for? I mean the numbers (ie 1.0.0)