Questions - Need some input

Having recently found my self suddenly and unexpectedly unemployed, I have too much time on my hands. While it's been great for my clean up efforts, it also allows me way too much time to invent, reinvent and experiment. I love to experiment and DIY different little ideas. I've had one crazy idea for a while now and have been running a prototype in a 20 gal attached to my main system. I call it a refugium for lack of a better word. It's unlit with about 3 inches of sand and gravel mix with a few ...

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