I use cypress mulch for mine and have never had any problems. You can get it readily at Home depot. A large 2 cu ft. bag cost $1.66 and 1 bag more than covered my 75 gallon tank, the substrate is actually about 4 inches deep from using the one bag. I can use 1 bag on numerous of my 20 gallon long tanks. Which is great and all you have to do is spot clean when needed Aspen or cypress either way is good.
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0.1.0 Brown Pacman
1.2.0 Albino Clawed frogs
1.0.0 Brown Clawed Frog
0.0.1 Superlight Baby Sulcatta
1.0.0 Juv. leopard tort
0.0.2 Fly river turtles
0.0.2 Savannah Monitors
0.0.1 yellow flame Niger uromastyx
1.1.0 Mali Uromastyx
0.1.1 Ball pythons
2.2.0 pastel Columbian boas
1.1.0 Hypo Hog boas
1.0.0 Hypo pastel boa
1.1.0 Hypo boa babies, Poss. DH sunglow
1.0.0 Coral albino boa (my baby)
and
1.1.0 Pomeranians (the wifes babies)

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