Can I use sand for my guppy aquarium?

Well im not sure about aquatic turtles but for guppies it doesnt really matter. If your filter product guide says do not use with sand or not recommended dont use it. Also the sand if your a beginner may be harder on you because its easier to clean gravel and when you disturb the sand slightly your tank is messy for 1-2 hours. So its your choice. :) Good luck