polgara Posted August 17, 2005 Report Share Posted August 17, 2005 Is there any special type of concrete to use and anything else i have to be aware of when attempting to make some of these for fish tanks? Quote Link to comment Share on other sites More sharing options...
Pegasus Posted August 17, 2005 Report Share Posted August 17, 2005 Concrete in the "raw" will leach lots of nasties, and needs to be "matured" before you put it in the tank... unless you want to seal it first of course. There are products that are used to seal concrete, like the ones they use for water tanks that hold drinking water... plus some garden centers carry products for sealing concrete fish ponds. Weight is another factor, but you could make a hollow structure by forming your shape over a mold to reduce the weight. Appearance.... Looks terrible until it has blended in and aged sufficiantly... but you could include small bits of rock stuck into it to give it a more "natural" look All the best with your project. Quote Link to comment Share on other sites More sharing options...
livebearer_breeder Posted August 18, 2005 Report Share Posted August 18, 2005 http://www.fnzas.org.nz/fishroom/diy-concrete-background-vt2335.htm Have a look Shae Quote Link to comment Share on other sites More sharing options...
Control Posted December 26, 2005 Report Share Posted December 26, 2005 Condy's crystals (potassium permanganate) should be used to cure concrete over a period of 3-4 week whenever it is used with fish of any kind. Those who know what they are doing when they build concrete fish ponds do the same. it is an old practice that alot of people seem to have forgotten. Ask your chemist. they should have it, if they don't tell them they are useless and go somewhere else. Use fresh water, add crystals and dissolve (don't worry about the colour the staining is not permanent on the concrete) place finished concrete in the water and leave for 3-4 weeks. During the curing proccess the water will turn brown and then clear, at this stage it is well cured. To cover my butt I will state the following: (Edit = Warren)... Do not add Condy's crystals to your tank. Do not add Condy's crystals to a tank with anything alive in it (including rock) Condy's crystals will stain things, be carefull. Don't use your bath, tub, sink spa or swimming pool to mix Condy's crystals if you want to stay married unless you want an excuse to replace them (wife or all of the above that is). Quote Link to comment Share on other sites More sharing options...
Rocform Posted January 6, 2007 Report Share Posted January 6, 2007 Try this forum for a lightweight concrete that is easily molded http://www.fnzas.org.nz/fishroom/synthe ... 17921.html Quote Link to comment Share on other sites More sharing options...
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