How many Hydro-Ball bags would I need...help?

[BettaShawn]

I have an 18"x 18"x 24" terrarium (Length, width, height) for a White's tree frog. How many bags of Hydro-balls would I need to cover 1-2" of drainage for it. The bottom of the terrarium is 18" x 18". I was thinking maybe like 2??

Zoo Med HydroBalls Expanded Clay Terrarium Substrate - Sand - Substrate & Bedding - PetSmart

[Crausse]

It took me a whole bag to fill the bottom of my 12x12x18 so I think you will definitely need 2 bags.

[velvety14u]

2 sounds about right..........I bought a 50 lb bag and did several.