Cracking build bones, I did pretty much same build as you last year mines 18x9. thats a real good idea for the bin in the ground, I didnt run a drip system into my fish house as I didn't have a drain close for the overflow but that's a good idea to have it draining into the bin and pump out. I no what you mean about natural light, I ended up putting sum double glazed patio doors in, how u finding keeping the temps up in the tanks ? Once again great build :thumbup:
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