I have not used soil for planting aquariums. If they goldfish get to it they will dirty up the tank fast with it. I have heard it can cause nitrate and other problems.
I consider sand an important part of a goldfish aquarium. They LOVE to sift through it, they do it a lot. I actually feel sorry for the ones I see in tanks without any substrate. It just doesn't make sense to me to deny it from them.
I consider sand an important part of a goldfish aquarium. They LOVE to sift through it, they do it a lot. I actually feel sorry for the ones I see in tanks without any substrate. It just doesn't make sense to me to deny it from them.