You can use sand so that the dirt stays on top.柔花月儿 wrote:pebbles will make it difficult for the pump to clean goldfish's excrement. It is bad for the water quality.Yuri Iwamoto wrote:to my defence.... I'm a terrible typer... And a lazy correctorStopwatch wrote:Those fish are cool. I'm fairly sure if I had some my cat would eat them though ~_~.
Yuri... um.Yuri Iwamoto wrote:I'd add some floor to that as well.
But my thought still stands, don't you usually add pebbles to the tank to fill the bottom...?
Also, actually it's good for water quality. You need some surface for the bacteria to grow on. Those are important to break down the nitrogen compounds your fish produce into fertilizer for the plants. I'm sure you can find some kind of plant that isn't eaten by the fish. Here's a nice page: http://thegoldfishtank.com/plants-with-goldfish/
Getting the fish tank into an equilibrium between fish and plants makes the whole thing much easier to care for - you won't have to change water as often, for example. (Also, it's a lot of fun to get it running properly, in my opinion ^^)
