Not quite sure why some people have had troubles with SMS and others don't. I've used it in 3 tanks just fine. (two of them didn't even have the SMS rinsed)
That being said I've never used Eco. So maybe it's truly awesome and feeds your fish and trims your plants, I don't know. I just think substrate should look nice, hold plants down, and provide good conditions for roots. SMS did that for $13 just fine.
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