Large fish for 29 gallon fish tank?

Get a couple or three oscars. They get huge and completely tame. They'll eat out of your hands and know who feeds them. They are the smartest fish I know of and I have kept multiple aquariums for over 35 years. I had one that would let you pick him up out of the water and pet him. He loved it and would swim into your hand.

An oscar will pick his teeth with an angel fish. If you want big smart, and impressive you gotta try 'em. Buy 'em as baby's cheap and see for yourself how fast they grow up to be hand sized pets that will impress the neighbors. They will be fine in that tank if you take good care of them. You'll probably get attached to them and want to buy them a 55 gallon.
 
Zebra Danios
Zebra Danios are surface dwellers and a peaceful schooling fish. Zebra fish are very active, lively and hardy. An excellent addition to any tropical aquarium because they are never shy, always visible and they feature a beautiful shimmering silver color that gives life to the aquarium. Zebra Danios are one of the best freshwater fish for starting out an aquarium. Zebra Danios are best kept in schools of 4 or more. When kept alone, they tend to be shy and nervous and get easily stressed out. Zebra Danios will school with other types of danios (leopard danios and spotted danios for example).
Maximum size: 2 inches - Average size: 1 inch
Sex differences: Females have more of a vivid silver tone then males and they grow larger and more round then the male zebra danio.

Clown Loach
Clown Loaches are suitable for freshwater aquariums 20 gallons and up. They can get quite large but they grow very slow, so they can be put in a small aquarium as long as they are eventually upgraded to a larger tank. Clown Loaches are often added as a bottom feeder to aquariums to control snails, they eat pest snails and bottom food like shrimp pellets. Clown Loaches like adequate hiding spaces yet they still need open space to swim since they can be active at times and very shy at other times. They can be put together in schools but they are solitary once they get older. The Clown Loach ia a great community fish addition for any tropical aquarium.
Maximum size: 12 inches - Average size: 6 inches
Sex differences: Clown Loach females and males are indistinguishable from each other.

Tiger Barbs
Tiger Barbs are schooling tropical fish that are quite active and an enjoyment to watch. Tiger Barbs are mildly territorial if they are not a part of a school. Minimum 3 per tank and they can be kept with other peaceful fish. Do not keep Tiger Barbs with slow moving, long finned tropical fish because they are fin-nippers and can be aggressive towards slow moving fish. Tiger Barbs are a hardy fish that will occupy all areas of a tank, top, middle and bottom. If your aquarium is small, 20 gallons and under, you might not want to include barbs because of their territorial nature unless you include other semi-aggressive fish then every fish school will establish their own territories. Tiger barbs are very hardy fish and a good addition to the semi-aggressive and fast-moving tropical fish aquarium.
Maximum size: 2.25 inches - Average size: 1 inch
Sex differences: Female Tiger Barb is more round and has lighter/pale color then males. The slimmer males have vivid coloring compared to females.
Cherry Barbs
Cherry barbs are a shy fish, so adequate hiding spaces are necessary. Cherry barbs are a peaceful (when in schools) and hardy tropical fish that are a good addition to a tropical aquarium. Sometimes males can be a little bit aggressive but they tend to be more calm when they are in a school. It is recommended cherry barbs be in a school of at least 4 so that they keep to themselves and do not pick on other fish, unless you can distinguish and acquire only females, then a pair will be fine in any freshwater fish tank. Cherry barbs are very shy and nervous when kept alone.
Maximum size: 2 inches -Average size: 1 inch
Sex differences: Females are darker colored with yellow toned fins compared to the male Cherry barb.

Red Tailed Black Shark
The Red Tailed Black Shark is a peaceful schooling fish when young, but beware they grow up to be solitary and highly aggressive towards their own species. They have been known to kill other Red Tailed Black Sharks that they once schooled with in an aquarium once matured. It is best to get only one per aquarium. These freshwater sharks are bottom dwellers that are very peaceful with other freshwater fish. Provide adequate hiding space for they need their privacy and can sometimes be shy. Other times, you'll find them swimming about in a frenzy with your other fish
Maximum size: 4.5 inches - Average size: 2.5 inches
Sex differences: Females are more bulky and more rounded then the slim and sleek male Red Tailed Black Shark
 
Even though it's 29 gallon, unless it's a 29H, it's not suitable for Angelfish. Consider the height of the angelfish in measuring the height of the tank.
Try 3 pearl gouramis, beautiful fish, but prefer temp near 80F
 
HI - I wouldn't go any larger than a 3 in adult fish. Considering your tank is only 29 gallons, and most fish need a male/female companion, you don't have much options with larger fish. Going small, like the Cardinal Tetras are a really nice show. I actually prefer Rainbow fish myself. They look drab in the stores, and won't actually fully color up until they are adults (anywhere from 4 - 12 months in age). Your fish also need to be compatible too, so they don't stress each other out. Stay away from any cichlids. Any livebreaders, rainbow fish, danios, tetra (some actually get 3 inches), or barbs. Those will be your best bet.

The general rule of thumb is 1 inch of adult fish per gallon of tank. Getting three 8 inch adult sized fish in a 29 gallon, will be under the limit, but you'd need at least a 90 gallon to make them comfortable.

Just think of it this way....would you want to live in your bedroom, with you bathroom, kitchen and living areas all in one room too? They need their space.
 
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