I set up a 75g reef tank about 7 years ago with tufa and a few good pieces of real live rock to seed it. I had the tank running for 2 years and never had any algae problems. I only had soft corals and a few fish in it but everything grew like crazy in the tank. I personally wouldn't use tufa again though because it really doesn't look much to me like actual live rock, even after cured, and it is probably 4x as dense as live rock as well. Keeping an eye on canreef for people selling cheap live rock is what I would recommend even if it takes awhile to buy bits at a time as your budget allows. Good live rock has lots of amazing things on it to keep you interested while you build your collection and I think you will be more satisfied in the long run.
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