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· Premium Member
8,540 Posts
If your bulbs are new and you do have that much light you WILL NEED to fertilize. You can't get enough nutrients to supply your plants needs from the fish. The El Natural set up (look at that forum and read the stickys) is even based on good top soil. You are using an inert substrate.

The mineralized soil has the nutrients built into it, which is why the fertilize very little if at all.

You might want to do some basic reading.
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