You can consider gravel little pea-sized stones. Estimating somewhere in the range of 2mm and 5mm, gravel has a comparative look to stones without the drawback. 

Much the same as stones, gravel is accessible in a wide scope of materials, permitting you to accomplish almost any substrate plan that you can envision. 

Since the holes around every stone are more modest, food and crap can't fall as far. Any food that lands on gravel can be effectively taken out with a gravel vac during upkeep. For the best substrate for betta tank, you would visit your aquarium guide.

What about Gravel? 

In spite of the fact that enriching gravel is substrates, just utilizing gravel is certifiably not a suggested arrangement. 

Its helpfulness as a covering compound just as a tasteful part exhibits how this common methodology is something to be strived for. 

Normally happening waterways experience this equivalent wonder. 

The movement of water stores materials in stream beds, much like a substrate in an aquarium. 

Materials are normally spread dependent on their size and weight.

This normally happening situation is reproduced utilizing the substrate and covering method referenced already. 

Important: some gravel types are sharp and have worn out edges. This can be exceptionally hurtful to base taking care of fish since when they swim against these sharp stones and burrow their countenances to scavenge for food through them, they can get cuts. These wounds can form into bacterial diseases that can conceivably slaughter the fish, so on the off chance that you mean on keeping base dwelling fish with gravel, look explicitly into round gravel. 

One favorable position of having gravel in the aquarium is that it considers live oceanic plants to be planted into it (with the expansion of root tabs.) While gravel isn't the best substrate for a completely planted tank since it doesn't give minerals to help plant development, it can help anchor the plants down and isn't excessively thick for roots to spread all through the lower part of the aquarium. 

Gravel is inactive, which means it doesn't change the water boundaries of the aquarium it is in. A few specialists favor this since they need their boundaries to continue as before. 

Gravel will in all probability not get kicked up in aquariums with a solid stream or sucked up by directs during support in light of its weight and size. Notwithstanding, due to the size of gravel, there exist spaces between the stones where flotsam and jetsam can fall into. Fish squander and uneaten food will in general get caught in gravel, so it is critical to vacuum this kind of substrate during routine water changes. 

How would I utilize gravel more clean? 

Siphon-fueled gravel cleaners are intended to eliminate soil loaded water from inside the substrate when you're doing your incomplete water change every week. The intensity of the siphoning water causes the gravel grains to whirl around inside and sucks the filthy water out, however gives up the substrate. 

When you get its hang, you should have the option to vacuum the greater part of the tank floor while just eliminating around 20-30% of the aquarium water, which you would then be able to top-up with dechlorinated tap water. 

You can begin a siphon-controlled gravel cleaner severally. Since I have unintentionally breathed in a few lungfuls of foul-tasting aquarium water previously, I for one incline toward not to suck on the finish of the hose to get the siphon moving - in spite of the fact that this is without a doubt the fastest and most broadly utilized technique among fishkeepers. 

To begin the siphon all the more cleanly, put your thumb over the finish of the hose and lower the gravel cleaning connection in the tank on its side. In the event that you rapidly gather up some water inside the connection and permit it to fill the hose by incidentally eliminating your thumb a few times, you should wind up with both the connection and the hose totally loaded up with water. At that point, you should essentially bring down the hose end over a can and discharge your thumb. The water should begin streaming all alone. 

Marina Decorative Gravel 

In the event that you'd prefer to add some tone to your tank yet don't need the fluorescent look, think about this top-notch enriching gravel from Marina. The epoxy covering secures in the shading so it won't blur or effectively chip. This gravel is additionally a wash clean assortment that creates no residue, so it's truly simple to add to your tank. 

Marina gravel comes in two tones, a brilliant pink and a blend of rainbow tones. It's an exceptionally dependable choice. While it's just accessible in single-pound sacks, it very well may be a decent decision in case you're simply adding a bit of shading to your tank. On the off chance that you blend it in with another kind of gravel or sand, you may be truly content with the look and impact!