While talking about foods, the tank is fed a diet primarily of mysis shrimp, Cyclops, spirulina flake food, New Life Spectrum pellet foods, sandeels, and on occasion frozen rotifers and ESV spray dried phytoplankton. Because I have many large fish, and some of these include questionable reef fish like Emperator, Annularis, Majestic, Regal and Blueface Angels, the tank receives several feeds per day, especially first thing in the morning. Keeping these fish well fed will help minimize them damaging the reef inverts, as a hungry fish is much more likely to pick on your favorite corals. If I were to do the tank over again, I would have actually made it 4 feet deeper so the fish would have more of a water column for their courtship and spawning and probably make it longer, but probably wouldn’t make it any wider.
Beginner Fish: Tropical Fish for Beginners in Saltwater Aquariums
A diet of foods like algae-packed cubes, or other quality marine flakes, nori (sushi wrap made of seaweed), and kombu (dried kelp) is best, and they'll usually tear this stuff up and eat until they look like they'd burst if given the opportunity. Do make sure to buy unseasoned/untreated types if you get nori/kombu at the grocery though, as you don't want to add any sorts of additives, preservatives, etc. Of course, surgeons will also find some food for themselves in most tanks, as well, as they'll graze over glass and rock surfaces picking at whatever grows there. If you aren't having a very, very serious algae problem, this won't be enough to keep the healthy, though. Thus, you should feed them daily at the very least, and two or three times daily if possible. In the wild they poke around all day nibbling here and there, so as is the case with most herbivorous fishes, eating one big meal a day (or even less frequently) is not what they are used to at all.
Marine Aquarium Fish for Saltwater Aquariums - Live Aquaria
I've got an odd story for you too, on the subject of feeding. Many, many years ago I had a tank that housed a yellow tang, a few damsels, a couple of clowns, and an extra-large carpet anemone (). I also had a creek right next to my apartment at the time, and I used to go net up a bunch of little minnows and feed them to the anemone, which helped it grow to a relatively huge size (20+ inches). After doing this for a while, much to my surprise, the tang took a liking to the minnows, too. Seriously! I'd throw in a few tiny minnows and the tang would always chase one or two down and gobble them up. Of course, it never bothered anything else in the tank, and it lived and ate with the anemone for around 4 years. Then, it apparently strayed too close to the carpet one night and met its demise. A sad ending for one of the first marine fishes I ever owned.
List of marine aquarium fish species - Wikipedia