I would recomend purchasing a bag of organic potting soil instead. It's fairly cheap and requires no prep. The labels are usually pretty detailed, so you can make sure you are getting a good balance of nutrients. I particularly like mixes using bat guano and earthworm castings. I dampen it a bit, add it straight into my tanks, and cap it. Never thought of using something like eco to cap. I have always used inert caps.
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