Concern over our pets is important, but listening to this type of worrying will just suck all the enjoyment out of the hobby Aquarium Rocks You have a far better chance of winning millions in the lottery than killing your aquarium fish with toxic coral residue.īut then the doomsday folks will say “better safe than sorry”. As far as we can determine, there has never been a single case of palytoxin poisoning of fish in the aquarium hobby. The same goes for coral or marine “live rock” which might have had a very rare and exotic type of poisonous coral on it (some Zoanthid coral species contain palytoxin poison). Note that other minerals like sulfur, fluorite, vanadinite, and cinnabar not only are very rare and aren’t found on the surface, but they also aren’t poisonous.Īnd as for poisonous explosive residue on rocks, if the rocks were quarried with explosives they will have parts per billion of water-soluble, easily degraded, nontoxic explosives on them till the first rainstorm. Other very rare poisonous minerals found only in a few mines are ulexite, borax, realgar, and orpiment. I do recommend that if you have pieces of malachite or azurite you do NOT use them in your aquarium. The chances of finding azurite or malachite lying about are about the same as the chances of being hit and killed by a meteorite. Note that saying this on social media will invariably get some response from a “know-it-all nitpicker” like “What about azurite and malachite, they’re poisonous?” Azurite and malachite are minerals found deep inside copper mines and are prized by mineral collectors. What is amazing here is that if you show a pile of various rocks on social media EVERYONE and I mean EVERYONE will give you a long list of minerals to avoid. Rocks with Malawi’s Just a Little Common Sense That being said, since any fish you add will have a million times more fish pathogens on its body than any rock can have, and you can’t sterilize a fish, it is kind of useless to boil or heat a rock. The only concern might be that there are a few species of blackwater fish that will not spawn in this water.Īnd it violates several laws of physics for a BOILED rock to “explode” (all the YouTube videos are of rocks in a FIRE PIT that explodes, a quite common occurrence). Aquarium Filled With Various RocksĪny form of calcium carbonate (“bubbles in vinegar”, limestone, coral rock, shells) can slowly raise the pH of the aquarium to 7.6 to 7.9 pH, no higher. Only avoid malachite and azurite as they can be toxic in some aquariums. There are a few rare minerals found deep inside mines that are poisonous but that is hardly a concern. For instance, there are virtually NO rocks gems, geodes, polished stones, or crystals that are damaging to fish in any way. There are a huge number of very firmly held myths about rocks that just are not true. Shells and corals are also perfectly safe with no treatment as are almost all gemstones, semi-precious stones, tumbled rocks, geodes, crystals, bones, and antlers. no boiling or bleach), including those that bubble with acids like vinegar. Rocks in the Aquarium Summary of Rock DataĪLL rocks and stones you will find in your rock yard, yard, or the local stream are fine just as is (i.e.
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