I think substrate is a topic that's often overlooked when it comes to setting up an aquarium. People tend to use gravel almost by default without considering what kind of fish they're going to be keeping.
Gravel is a good substrate but it won't work for all fish. For example, goldfish often eat gravel which can cause choking or obstructions. African dwarf frogs (though not a fish) are known to eat gravel as well. With cories, gravel can wear down their barbels and snout.
Sand doesn't usually cause any issues for fish but silica based sand can sometimes be too sharp for certain fish, like plecos and catfish. There's also the fact that limestone based sand can mess with the PH of the tank.
And if you have an undergravel filter it wouldn't be advisable to use any type of sand.
The importance of choosing the right substrate
Discuss all topics related to freshwater and planted tanks.
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