http://www.aquaticquotient.com/forum...902#post774902
Here you go

I've tried these two brands and they work fine. Just don't use in excess, else you might risk making the soil
Anaerobic. Generally as how you might experience mixing soil with water, it will turn the water into a "brown soup". Dirting a tank is best capped with aquarium gravel or inert substrate of your choice, as long it's not too coarse (e.g. using large pebbles etc)
A rule of thumb, planting is best done before filling up the tank with water. Upon completion of the planting process, place a piece of plastic sheet over the scape and slowly pour the water until the tank is full

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