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OK...so I have some similar questions. I have a 135 gal that I am putting back together after a 5 year hiatus. I used to use an under gravel filter and had a single fluorescent 48" tube light. I had some type of sword grass that grew like a weed, but nothing else grew well. So now I am hearing about substrate. I bought a large Eheim canister filter (up 160 gal) and a new 72" three bulb light hood (65w). I envision substrate as being like "mud" on the bottom of my tank. My question really is, what is substrate, when do you need it and how much? I don't want a lot of plants...I still want to see my fish. Is this substrate used in conjunction with gravel?
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Wizard Dog
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