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oh i didn't know that breeders keep their breeding tanks without gravel...umm..so they can easily spot the eggs right? i didn't know that haha..i was gonna start a 35 gallon cichilid tank and breed them so i shouldn't have any gravel you think?Isabella said:If you won't have live plants, you don't need any gravel. I agree that a tank without a gravel looks kind of "bare" but it's totally up to you. It's true that many breeders keep their breeding tanks without gravel. This is because they need to be able to clean their tanks well and fast. With gravel, you have all fish wastes getting trapped under the gravel, and unless you don't remove these wastes (through regular gravel vacs), they will cause the quality of your water to deteriorate.
One thing though: I believe gravel provides a lot of surface area for the beneficial bacteria to grow. I know that most of the nitrifying bacteria are in the filter, but I also believe that they're on all surfaces inside the tank, and not just in the filter.