Probably not a must but it will help with water quality. A really good book that covers breeding, raising tadpoles is AVS Chacoan Horned Frogs, if you want the best results I'd recommend you purchase that as it's wrote by one of the first to breed the Cranwell's horned frog in captivity and is very detailed unlike most other books I've came across.
Water temp for the tadpoles should be in the high 70 to low 80s F, basically what they frogs will need.
It's not about death, allowing the froglets to eat eachother (within reason) could prove quite important for the best development as it will be a huge calcium boost with the bones and what would probably happen in the wild. Many have been raised individually to prevent this and turned out fine, I'm just saying if it does happen it's nothing to feel bad about as it's healthy for them and probably perfectly natural, so maybe the best husbandry depending on how you look at it





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It's a good interesting read and covers other species as well. I've purchased two other books on Horned frogs and they've been bad reads, outdated husbandry and more like a child's book than anything, so be careful if you purchase any others. That one I recommended is the only one directly on Horned frogs that is good that I know of IMO, however Frogs and Toads by Devin Edmonds includes their care but it's only a small section of the book, so not as in depth but otherwise good
