I voted either. For me, it really depends on what I'm setting a tank up for, how permanent it is, etc, etc. I like FBs because I don't have to water the plants as often, and when i do, I don't have to worry about saturation and root rot, plus there's more water, leading to more stable parameters. If it's a tank where I need to make the best use of height, I will either separate with a devider or use a separate container for a pond; for example, I have a dish pan in my CWD tank. It's a QT tank for her, and I needed to maximize height and make it easy to clean.
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