I beg to differ with all of the inputs, to some extent. I actually have a 150 that is set up exactly the way you are talking about. I have half the tank set up as reef with softies, mushrooms, zoos, etc and the other half with no decor for swimming room. The tank actually started off years ago as a shark tank, became a full reef for 6 or 7 years after that and last summer, became a hybrid, if you will, predator and reef. I have a 12" female banded bamboo that is very inactive, that spends 95% of the time hidden, but comes out at feeding time, snatched food and goes back to hide. I have a newly hatched male in a smaller tank until he is ready to be introduced. When I had sharks before, I had a male and female that maxed out at about 22-24". It was set up with minimal rockwork at the time, but kept them for a few years in there before I had a shark/eel battle that left both the male shark and eel dead and then just got rid of the female as she was very inactive and boring in there by herself.
I understand that after some time the sharks will need to go to a larger tank, but I am ready for that. I am just stating that I currently run a setup that is reef and sharks and have not had any water quality issues. I have a massive flow rate, sump filter, canister filters, skimmer and a a small algae turf scrubber (only recently added). I have no nuisance algae trouble, tons of coralline growth and corals are thriving. I also have about 8 or so additional fish, damsels, clown. engineer goby, two columbian sharks, a small green spotted puffer and the shark, as well as brittle stars and other clean up inverts. The tank has been set up this way for almost a year now with no compatibility or water quality issues.
I am also very experienced (15+ years) and am always on top of the goings on in my tank so that helps. I know that this setup won't be able to be maintained forever, but show me one that ever does.Or maybe it will. I have the ability and willingness to upgrade to a 300 gallon in my basement when the need arises, but am going to keep things the way they are until I have to change. I also have the experience to know that fish can die even under the best conditions, sharks are no different than any other fish in that regard, and maybe that day will never come where I need to upgrade. Not trying to sound cruel, just being realistic.
One final note, as for all of the opinions on here and other sites about the max size of bamboos, I have very rarely seen one anywhere or any actual owners that have a 3-4 foot banded shark. I had two for 3 years or so and they had pretty much stopped or slowed way down their growth at 22-24". I understand that at the right conditions and especially in the wild they can get 3 feet or so, but we all know that under captive conditions, any fish rarely reach max size. If you don't overfeed and keep temps down, it is possible to keep size down as well. Believe me, I have searched and searched over the years for pics and vids of these sharks and have seen maybe one or two ever that were any more than 2 feet long in a home aquarium. There is nothing cruel about underfeeding and other ways to control growth. My fish are fed plenty well, are healthy and my water quality is always perfect. Has been for years and I never lose any inhabitants that make it past the acclimation stage.
I will post some recent pics when I get a chance to show you my set up, or feel free to ask any questions that may help you.