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Gravel or no gravel

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I always thought a fish tank must have gravel but I now know this is not always the case,

Looking for opinions:

Tank size 6x2x2

I have a breeding pair and their fry of Red Devils, should I have:

1) no substrate

2) have sand

3) have shale

4) have gravel

What's best?

Tank size 3x1.5x2

My other tank has a breeding pair of green terror and their fry.

Same question, what's best?

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