I've made two batches of DIY rock, cured for about 4 weeks in fresh, and 1st batch is in my tank. works real good and cheap, but raises ALK quite a bit at first. Starting to grow corraline and worms now. For my next batch I'l be using the method with Water softener salt in the mix for more porousness. (found on RC, ULTIMATE DIY rock thread) That is the one draw back i found, not as many little holes. I got around that on a few pieces by drilling tho.
here is some, cave worked good
