To get the gravel out of my tank I poured them into a plastic container I found in the kitchen. I didn't rinse it out first.
Before I put the gravel back in the tank I rinsed them off, but am afraid the container I poured the gravel in before this may have added soap residue to the rocks from being washed previously. Is this possible? Should I be worried? I know we aren't supposed to use soap to clean fish tanks, but how much soap could harm a fish? Should I just throw the gravel out or is it really that big of a deal?