While hitchhikers and phosphates may be a concern, these are relatively easy to deal with, with patience and a little effort. For me the choice to go with dry rock was simple....
COST.
I have all the time in the world to wait for dry rock to become live. This is already a VERY expensive hobby, so if I can save A LOT of $$$$ on something like rock, while still getting quality, I'm in. This allows me to use that money for much more important things for the system.
I would love to fill my tank with TBS rock, but at $600, it just isn't in the cards. Not when I can fill the tank with dry rock for $200. The only other cost is time, and that is something I don't have to pay for.
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Current tank: 40B work in progress w/20L sump
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