First, I have read our Frog Forum Fire-Bellied Toad Care and Breeding Sheet, I have 5 FBT's that I love dearly and up until just now I have always thought that they were happy because I am giving them a proper habitat, but have I?

I got to looking at fellow members tanks and they all have some type of substrate, I have 5 FBT's in a 20 Gal Long Aquarium that I built for them last February so I really have not had them through Winter Time. They have no substrate, they are in a tank filled half way with water, and with rock, slate, tons of plants and hiding places but no Cocco Fiber to burrow in for the winter, do they need a substrate to burrow in during Winter to be happy?

Should I drain my tank and replace with CoCo Fiber

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