Hello,
Ill wager your tanks fairly new, How big is it ?
I would guess its just experiencing an algea cycle, this will end at about 5-6 week point, and shift from brown to green algea.
Then is the time to focus on snails, herbivourous fish, I would leave the crabs at the store....
If the tank is new....leave the chemicals at the store aswell, all it needs is patience.
There is not much any chemical can give you, that a water change cant.
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Confucious say : Things that come to those who wait, will be things left over by those who didnt.
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