Flourite isn't mushy, it's like little flakes kind of. It's hard. It comes in red or "dark", and is fairly heavy. Eco-Complete is mostly black, and the size varies a lot in a bag. It's fairly light-weight. You may get algae from using either substrate as both are used in planted tanks and are somewhat minor fertilizers, although out of the two I would think you would have better luck with the Flourite.
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~ Mindy
SPS fanatic.
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