Seachem Onyx Gravel 15.4 lbs

Onyx Gravel ™ is a specially fracted porous substrate for the aquarium. Onyx Gravel™ is suitable for any aquarium environment including reef and planted aquariums. Onyx Gravel™ is most effective when used alone as an integral substrate bed, but it may be mixed with other gravels or sands. Gravel modifiers are not necessary. Onyx Gravel™ is not chemically coated or treated but does have a slight buffering capacity. Also available as sand.

5-10 mm average size

Sizes: 7 kg bag

Concentration of nutrients in Onyx Gravel™
Aluminum	822
Barium	5
Calcium	197500
Cobalt	4
Chromium	10
copper	4
Iron	2846
Potassium	417
Magnesium	115400
Manganese	43
Sodium	135
Nickel	7
Vanadium	8
Zinc	23