I have a 75 gallon and I got 7 20 lb bags of eco complete. I had one bag left over which I used in my 10 gallon. That gave me just 3 inches in each tank. I also have egg crate under the substrate so that takes up some room
as time has gone on I notice that some spots on the 75g are lower than I would like, it seems to have setteled lower. I could have added that 7th bag after all.
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