Good job! I found my 125 on craigslist as well. Dirt capped in sand is what I would recommend. Just find some organic top soil, it's mostly peat anyway iirc. Your 48" fixtures, staggered, will do fine as well. I have a single finnex 24/7 48" light over mine for the sunrise effect and it spans nearly the whole tank by itself. I would consider adding some glass bracing where that chip is, just an option. The silicone bottom should be fine, even with acrylic. This would be a good project tank for a sump! Just saying.
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