food and nutrition

Nutrition Spray

Question: Do gravel keep nutrition from draining away from soil? I am having an aquarium with volcanic soil only. I try to plant some aquatic plant like glossostigma. However, most of them withered only two survived. Everyday, I spray liquid fertilizer for my aquarium since its cheaper than aquarium specialized fertilizer. I started to wondering why most aquarium have gravel on top of soil. Does gravel keep the fertilizer or nutrition trapped in soil? What are the function of putting gravel on top of soil?

Answer: it makes it look "better" in an aquarium. it has nothing to do with holding nutrients (gravel is very bad at that) the soil holds the nutrients (clay is best, but it clouds the water.

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