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the gravel I have was used in a fish tank it is natual with no color,it looks just like river rock but is about a 1/4 to 1/2 inches in diameter
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Ya, you can use almost anything for
growing medium as long as it does not affect the pH or add
nutrients to the solution. Each type of growing medium has its own set of pros and cons. The big con with rock is it's not porous, so it cant absorb air or water. Depending on the size, the air probably wont be a factor because there will be enough space (but not too much) between the rocks for air. But because the rocks cant hold moisture you will probably need to water more frequently (but not for long periods), mostly depending on your setup, type of plants and temperatures. In the case of drip systems, you may want a continuous (rather than on/off) flow dripping because the water does not submerge the roots like in a flood and drain system. That would likely suffocate the roots if submerged for long periods of time. It will probably take you a little time to observe everything and to dial it all in just right, but should not be a problem.
P.S. After washing the rock, I would also sanitize it by soaking it in bleach water for an hour (or boiling water for 20 min). Then wash off the bleach water thoroughly.