i haven't actually got the 5.5 yet. but i do have a 3 liter bag and a 9 liter bag of aqua soil sitting around. i stuck the 3 liter one into my eclipse 6 (witch i think has a smaller foot print than the 5.5) and it looked like i would need to add about another 1/3 of a 3 liter bag to get the depth i was looking for...
so in short, you could get away with one 3 liter bag of aqua soil in the 5.5, but i think you would actually want more.
edit - buy one, and if it's not enough, get more. (i just picked up what homer put down, lol.)
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