Don’t let the naysayers scare you off the thought of putting together a saltwater aquarium. Yes, maintaining a saltwater aquarium takes a bit more effort because saltwater fish are more sensitive to changes in the water and their environmental surroundings. Plus, you’ll have to pay closer attention to the ph levels to ensure a stable and comfortable environment for all the fish. It should be noted that some species are hardier than others when it comes to changes in the water.
Once you’re up and running with a saltwater aquarium the next obvious question is what are the best saltwater aquarium fish to put in the tank? Everyone has their preferences, but listed below are my favorite types when I was a salt water aquarium fish beginner.
Community Tank: Housing Multiple Fish Together | PetSmart
I'm not sure I'll ever get a Betta either in its own tank or add one to my existing tank, but I love how you mentioned adding it to a tank that's already established to try to prevent him from defending a territory he's established. I've heard something similar about other types of fish. In large tanks, some fish will establish a territory and attack anything getting too close. I've been told changing the location of some of the plants and decorations will generally stop that behavior because it then becomes all new territory. I don't know if that's true or not so I'm just sharing what I heard.
Pet Fish for Sale: Tropical and Freshwater Fish | PetSmart
The next thing to cover is their tendency to not get along with each other. Surgeonfishes are safe with invertebrates and most (but not all) will get along just fine with other types of reef-safe fishes, as well. However, in general, they don't care much for other surgeons. While many live in schools in the wild, trying to keep two or three of the same species in one tank will usually lead to trouble. Still, if the tank is big enough and several tangs of similar size are added simultaneously, their schooling nature just might override their fighting spirit and they may be okay with each other.
Which Aquarium Tank is Best for Your Needs? | Tropical Fish Success