Ok well i just got a new fish tank today and it was a whole kit but i didn't realize it didnt include the gravel. I was going to get the fish tomorrow. Would it be ok to put the fish in at the same time as the gravel? or should i get the gravel nd let the filter run for a day or so before i put hte fish in? i know to condition the water ofcourse but i didnt know if the gravel made a difference. nd i know you have to rinse them too. Thank you 