Hi there, if you planning to have some low requirement plants like moss, you can opt for cheaper soil alternatives i.e. GEX brand for example. They work well for low tech setups as well.
Additionally, if you are only going for moss only tank, then there is no need to have too deep a substrate bed since you will/might not have any root plants. My setups, at most only had about 3-5cm worth of soil all around. (flat)
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