3. Because it acidifies the water it can 'unlock' heavy metals into their toxic free-ionic forms. The chemistry is as follows. Oxygen (and natural bacteria) in the water oxidize the sulphide component of pyrite to sulphate (i.e. sulphuric acid). The low pH acidic water produced then activates the iron and any other heavy metals present. Thus it is a triple whammy. Pyrite is the active agent in the notorious acid-mine-drainage (AMD). AMD is just as likely to arise from coal mines as from metal mines. This is because pyrite is often present in the shales and sandstones that surround the coal seams as well as in the coal itself. Pyrite is easy to recognize. It has a brassy yellow metallic luster and often forms cubical crystals with sharp edges (you may need to look at it with a magnifying glass to identify these edges if the rock has been tumbled around in a streamIt usually occurs as spots or streaks on the surface of the rock. If the specimen is weathered, i.e. has been exposed to rainwater or stream water, there will sometimes be a halo of rust around the pyrite crystals.. This is because the sulphide is gradually converted to oxide by the weathering processes. Here is a case where 'rusty' rocks are definitely not harmless. However, the residual presence of brassy flakes of pyrite will be an obvious warning in such circumstances. Above is a picture of a rock with a lot of pyrite mineralization. Note the brassy metallic luster (fool's gold), the sharp edges of the pyrite crystals, and the incipient iron oxide (rust) discoloration round some of the pyrite. You would obviously reject this rock out of hand--or keep it on a shelf as a mineral specimen. Pyrite crystals in rocks such as limestone or slates may be less spectacular, but they are still obvious. Clearly you should never put any rock with visible pyrite into your tank. In conclusion, observe the common sense approaches above and you will never have to worry about placing a rock into your aquarium again!
16 oz., A fabulous color complement to any tank, bowl or aquarium
Haha, I had a 10 gallon aquarium. I didn’t use any guides. I just bought all synthetic ingredients, multi-colored rocks, plastic plants, a filter, heater, and I happened to keep it on my dresser where it didn’t get much sunlight. I was told by the lady at the pet store that lived 1 mile away that we could use tap water since we both owned wells and although that water was high in iron content it seemed to do fine.
Although I only bought 3 fish for the tank.. I could have bought more, but my one mistake was not studying which fish went well together. Anyway, my cleaning ritual was to drain the tank and scrub it clean. I never bought any algae eating creatures.. Unfortunately I cleaned the glass and scrubbed it too hard one too many times. This caused a crack in the bottom of the tank. It didn’t crack when I was cleaning it in the bathtub, but later when I had it filled back up with water.
These accents add depth and beauty to your undersea garden
And then, at long last, once your trial hardscape truly pleases you, you are really ready to decorate your aquarium. There is a reason for this. Instead, methodically place your arrangements in your tank, one by one. After all, you cannot make any mistakes because you already made all the design decisions and you know that it will work. It is not necessarily the weight of the stones that will crack your glass, but the weight of the stone concentrated on a few grains of sand. Also, rocks placed on substrate will invariably subside over time. And then there are the problems one can have with tank inhabitants! It is amazing what determined digging fish can accomplish in undermining rocks that rest on gravel, by moving just one grain of gravel at a time! Use a clean paintbrush to flick substrate in below rock edges. If this does not do the trick, you may have to flush it in with a little water, which means you might have to siphon that water out again before your final fill, as it will probably be dirty. Then strew your pebbles and small debris in a way that looks natural.
Decorating Your Fish Tank: Dos and Don'ts | PetHelpful