Quote:
Originally Posted by MatPat
You could but I think the problem with concrete products is that they may increase the KH of your water. If you want caves for soft water species using concrete may not be a good idea but if you are using it for hard water species, it may be OK.
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In addition to this, Quikcrete will also get weak and crumble after some time in the tank as the limestone is dissolved. The acidic ph of most planted tanks will eat it away.