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I've got small natural looking gravel in the tank. It does not have a undergravel filter, it has a hang on back and canister filter. I'm thinking about getting sand for the tank. If I did decided to get sand for that tank in the future, would I be better off taking out all of the old gravel and then adding sand, or keeping both sand and gravel in?

You'd want to take the gravel out first, as the small particles of the sand would sift between the pieces of gravel and the gravel would end up on top. That'll be a big project!

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You would have to remove all the gravel first. It would be like a complete rebuild.

Next question why sand in my opinion sand is more trouble than it is worth?

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That would be a bunch of work just to remove the gravel. Why I like sand more is because it looks more ocean looking. "Fancy Gravel" is not in that tank, but I really can't stand that kind because of how fake and cheezy it looks.

A tank I bought used had faded purple gravel in it, was really gross, so I decided to switch to sand.

As has been mentioned it's a complete redo, since it was an office tank, I had to fit it into my work schedule and decided to do the tank half at a time. I used some stones to keep the gravel and sand from mixing till I got to doing the other half a few weeks later.

The whole switch over took a month + and for a month after I placed sand in it looked ok, but after that I started losing fish (from gas pockets that occurred even with turning the sand and having MTS in the tank), started losing filters (from the sand scouring the innards) and started losing the clean look, due to the inability to have enough water movement to pick up the waste from the sand but not the sand itself.

If I did it over again, I would have probably gone with a thicker grain sand/smaller gravel. I used playsand that not only took a lot of rinsing but ended up being the downfall of the tank.

^_^