Convict Need Help!?

[Maxantonio11]

I am getting black convicts and new a good base like sand gravel or marble? What is best and cheap.
I live on a lake and water is down. Would it be bad if I took sand from lake. Cleaned it up good and used it or would it still have bad stuff

 

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Gravel's best

 

[Convict2161]

I like sand... They will dig no matter what you put. My preference happens to be sand though.

 

[Andrew McFadden]

Sand all the way everyday

I wouldn't take it from a lake imo it could have something bad in it that you don't know about.