01-13-2010, 12:58 AM
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Regarding the pots made of limestone or any calcium area, there is nothing wrong with using them if your fish absolutely need hard alkaline water. In African Rift Valley biotopes, these are quite useful. Now if they were used in Amazon biotopes where acidic water is often the norm, it's another story as they absolutely do not need the buffering properties by these particular pots. I don't see anything wrong with using porcelain and ceramic pots so long as they are not glazed. You'll find some Goldfish enthusiasts love to use decorated pots and vases for their plants in Goldfish tanks. I also use porcelain bowls myself.
Originally Posted by MOA
It is a bad idea to use pots made with limestone or any other calcium-based ore. However, this does not happen all that often. Most basic pots will work so long as you stay away from the fancy display ones and the ones that have been painted.
To plug up the hole in the bottom you can use aquarium silicone, but wait 24 hours before placing such a pot in an aquarium. Also, it is a good idea to soak any pot for a least 24 hours before placing them in the tank. This gives the aquarist the chance to test what effect the pot has on the water chemistry. (Use tank water and an airstone to circulate the water in the soaking bucket.)