Will this fill a 40 gallon?

Fill, no, it will provide a nice base though

how much of this would be needed for a 18x24 bio active leopard gecko tank?

Thank you for your question. For an 18x24 we would recommend adding 36 quarts of substrate. If you have questions about this recommendation you are able to speak with a representative directly through our email: customercare@thebiodude.com. We would be happy to assist you!

How many bags is needed for a 4-2-2 for about 3 inches deep?

Good Afternoon! You will need four 36qt bags along with four 36qt bags of the Bioshot for a self sustaining bioactive soil. I hope this helps! Thank you, -Caroline

Do I need to have a bioactive tank to use it, or can it just be used as a good base substrate for a naturalistic tank?

Thank you for your question! You do not have to have a Bioactive enclosure to use our substrates. Our substrates will work well in a Naturalistic enclosure as long as the substrate is changed on a regular schedule (at least every 2-3 months) and spot cleaned in the meantime. I hope this helps! Please feel free to reach out if you have any questions or if we can be of further assistance.

ASIN	B07Z5CJ573
ASIN	B07Z5CJ573
Best Sellers Rank	#30,661 in Pet Supplies ( See Top 100 in Pet Supplies ) #73 in Terrarium Substrate
Brand Name	BIODUDE
Customer Reviews	4.7 4.7 out of 5 stars (417)
Date First Available	July 2, 2019
Date First Available	July 2, 2019
Item Weight	30 Pounds
Item Weight	30 Pounds
Manufacturer	The Bio Dude
Manufacturer	The Bio Dude
Size	15"LX7"WX22"H
Style	Modern
Target Audience Keyword	reptile-and-amphibian-pets

The Bio Dude Terra Sahara Bioactive Reptile Substrate 36 quarts for terrariums and vivariums. Bioactive Substrate for Bearded Dragons, Uromastyx, Leopard Geckos and More!

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