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    How often do you change your reservoir?

    I'm planning on growning 5 plants on a 2x2 space. If I make a res with 36"x36"x6" res that would amount up to 33 gallons of water. Having the fact that a bigger res means lesser water changes as it is more stable and makes a better choice. But I'm thinking if 5 gallons would be ok. I've...
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