The M,S,L is just grain size and the Special has extra nutrients and stuff packed into it....I always get the Special S since all my tanks are small but on a larger tank(55g+) I would go with something larger.
Also keep in mind that if you plan on uprooting plants a lot the Powersand can be unearthed to the top which looks kind of bad but can be pushed back down, basically a pita if there will be lots of uprooting.
ction over form
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