Seachem flourite
Ada Amazonia
Eco complete
These are my top three.
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do you need to fertilize the potting soil or wil it have enough nutrients in it to sustain a heavily planted tank
I've never used it, but it should start off fairly well fertilized. Water (and water changes) will leech out the fertilizers, though. If you're heavily planting a tank, you'll need to add ferts to the water and/or plant tabs to the soil.