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Ive had fishes for over a year and did start both with a fishless cycle. But this is my first buying everything with fish included. Over the next couple of weeks ill be purchasing a 55 gallon tank from someone who is going to be moving soon , included in the purchase is the filter, the lights, heater, gravel, decor, plants and all the fish living in it. When i move it over to my house i plan on keeping all of it but i do wish to change gravel to sand, so my question is if i should first set it up the same way , since it will be new water, keep it that way for about a week or so, then slowly change it out to sand so i dont mess up the cycle. Or can i start it off already half sand half gravel ?