2007-06-01 06:27:39 · 5 answers · asked by Anonymous in Pets ➔ Fish
The "gravel" is usually quartz or granite - both are inert, so they don't change your water chemistry.
The larger rocks are more varied. There's scoria (sold as "lava rock" or "tufa"), sandstone (this has the appearance of sand grains stuck together - can have nice banded patterns) - Pagoda stone is a type of sandstone with an uneven surface because some bands are more resistant to wear than others), slate (~1/2 inch thick sheets of compressed clay), quartz (rose quartz, white quartz), gypsum ("Utah ice"), reef rock/lace rock (travertine, which is a calcium or calcium/magnesium carbonate, some also go by the name tufa, but are white or light colored, the scoria is red/purple/brown). Gypsum and travertine can affect your tank water chemistry, although gypsum is rather slow to do this. Travertine, reef rock, and any other type of carbonate material should only be used in cichlid or marine tanks that need a high pH.
2007-06-01 07:01:17 · answer #1 · answered by copperhead 7 · 3⤊ 0⤋
I don't know about you, but I always picked my own from local alluvium -- the rocks I chose were granite.
2007-06-01 06:38:09 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Well they are rocks
2007-06-01 06:29:52 · answer #3 · answered by Muffin 5 · 0⤊ 2⤋
acids, lava
2007-06-01 07:18:01 · answer #4 · answered by .:g@bii:. 2 · 0⤊ 1⤋
fish tanks. DUH
2007-06-01 06:35:26 · answer #5 · answered by Anonymous · 0⤊ 2⤋