07-24-2012, 01:37 PM
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Before jumping into anything, you should also consider the fish in the aquarium. Some might be better with a change of substrate, others not.
The gravel you now have is on the large size, but this is workable. If you could tell us the fish species, we might have more to suggest on whether or not to change the substrate.
And. welcome to Tropical Fish Keeping forum.