I have sand now, and i've been told this isn't the best substrate.
What could i add to make it better?, Pictures might help aswell...
My tank size is a 15 gallon, any help would be great thanks.
Small, pea-sized gravel (about 2-3 mm in diameter) is a good choice, or, if you're willing to invest, you could look into fluorite (it's a product by Seachem)
Sand might compact on you. It might be best to add a whole new substrate. If all is well and it is an established tank i would not worry about it. But if there are issues ADA now imports through the Senske's so maybe some Amazonia soil.
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