Maybe a Mod can move this to the general section rather then the Disease part?
The problem I foresee mixing gravel and sand it'll compact down real heavy if you mix it 50/50 and that'll cause you headaches over time cleaning. So you may want to consider something like half of the tank sand and the other side gravel and put some slate in-between against mix up. But it will not have a impact on the fish; most fish actually prefer sand over gravel.
also a note if you mix your sand and gravel like in layers the larger gravel will always work is way back to the tob as the sand settles under it.. ( i tried that and it was kind of wierd to say the least) .. personally if you are going to go through the trouble take angels advice and set up something between them to avoid hassles later
A divider separating the sand and gravel would be a good idea, say a line of low rock, wood but in my experience rock tends to stay put better. Otherwise the two will mix over time, there are currents in tanks, fish moving substrate in varying degrees, so separating it with a material divider is a good idea. B.
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