oneeyedfrog Posted December 8, 2009 Report Share Posted December 8, 2009 Hi, I recently acquired a metal framed tank nearly 5 ft long . I was surprised to find it had a concrete bottom. It belonged to an elderly lady who said it was her fathers so it must be pretty old! I was just interested to know if a concrete bottom was a common thing as I have never heard of it before. Or perhaps it was something the father did to fix a broken glass bottom. It doesn't seem to leak and is outside filled with green water and daphnia at the moment. Quote Link to comment Share on other sites More sharing options...
Carlos & Siran Posted December 8, 2009 Report Share Posted December 8, 2009 hhmmm, I wonder if it would leach lime and stuff into the water? Quote Link to comment Share on other sites More sharing options...
livingart Posted December 9, 2009 Report Share Posted December 9, 2009 if it is that old it should be fine i would leak test outside first Quote Link to comment Share on other sites More sharing options...
Caryl Posted December 9, 2009 Report Share Posted December 9, 2009 Slate was commonly used too Quote Link to comment Share on other sites More sharing options...
Dimsum Posted December 9, 2009 Report Share Posted December 9, 2009 Swimming pools are made of concrete and tile, so guess tanks can be too Quote Link to comment Share on other sites More sharing options...
jim r Posted December 9, 2009 Report Share Posted December 9, 2009 I have heard of slate and wood but not concrete, I would keep an eye on the PH levels. Quote Link to comment Share on other sites More sharing options...
oneeyedfrog Posted December 9, 2009 Author Report Share Posted December 9, 2009 I guess if I did end up using it for fish I will seal the concrete. Any suggestions on the best product to use? Quote Link to comment Share on other sites More sharing options...
GeeTee Posted December 9, 2009 Report Share Posted December 9, 2009 I agree with jim r on the ph. I got rain water from my parents to do water changes.It came out of a concrete tank and the ph level was over 8. Quote Link to comment Share on other sites More sharing options...
smidey Posted December 9, 2009 Report Share Posted December 9, 2009 i have a concrete tank that our water comes from & the ph is around 7. others that have plastic tanks are around 6 or lower i believe. Quote Link to comment Share on other sites More sharing options...
Mr McFish Posted December 9, 2009 Report Share Posted December 9, 2009 Our rain water is about 6.5 out a concrete tank. Quote Link to comment Share on other sites More sharing options...
Caryl Posted December 10, 2009 Report Share Posted December 10, 2009 You can buy a sealant for concrete water tanks to make sure it is safe for water. Don't know what it is called though but it should stop the pH from rising as it will seal the concrete. Quote Link to comment Share on other sites More sharing options...
oneeyedfrog Posted December 10, 2009 Author Report Share Posted December 10, 2009 I have decided it would make a better hot house nursery for seedlings. I wondered if concrete bottoms were the norm years ago but perhaps not. The lady kept goldfish in it up until a few weeks ago. I like old things ( luckily for my Hubby :lol: ). I like to think about what it has "seen' in its "life". Quote Link to comment Share on other sites More sharing options...
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