Jopinga206 Posted February 7, 2021 Share Posted February 7, 2021 Does anyone have any experience using plaster of paris in their aquariums? Joe Link to comment Share on other sites More sharing options...
StevesFishTanks Posted February 7, 2021 Share Posted February 7, 2021 I have used it to repair walls. Never thought about it in a tank. What would be your application. Link to comment Share on other sites More sharing options...
Jopinga206 Posted February 7, 2021 Author Share Posted February 7, 2021 Apparently you can make molds with plaster of paris to dissolve in your tank to harden your water. Similar to a wondershell. Not exactly a wondershell, but very cheap if you need to do it on a lot of tanks (I hear). I think its gypsum, which is calcium sulfate. I think.. Link to comment Share on other sites More sharing options...
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