Probably a large Cory catfish (they only get to 3-4 inches) so that it doesn't get eaten or attacked by the Angelfish. P.S. the Angelfish needs a tank of at least 30 gallons to be happy.
A small bottom feeder like a dwarf shrimp or a small snail would be suitable for a 5-gallon tank.
Some suitable small bottom feeder fish for a 5-gallon tank include dwarf shrimp, pygmy corydoras, and otocinclus catfish.
Some suitable bottom feeder fish options for a 5-gallon tank include dwarf shrimp, snails, and small catfish species like pygmy corydoras or otocinclus catfish. These fish can help keep the tank clean by eating algae and leftover food from the bottom of the tank.
None. That's too small.
i have 2 fantails and 7 danios live in 14 gallon tank very happy together. danios can be known to fin nip but this is more likely to happen when there are only two or three of them. they are more happy living in schools of 6 or more. they dont bother with the fantail at all.
yes as long as there are not any other males or female bettas
Most suckerfish get too big, but an apple snail (same as a mystery snail) or some ramshore snails are awesome.
That tank setup is fine. In fact, you could even add 1 or 2 more zebra danio(s). It is recommended that danios live in a shoal of at least 5.
You would need at least a 150 gallon tank
Yes. Feeder fish just like all goldfish grow depending on the size of their environment. I once had a feeder fish in a 50 gallon tank that was 8/9 inches long when it passed at the age of 7.
There are a few major problems with this setup. :( 1. Danios need to live in a school; usually with at least six to eight fish, which your aquarium is not big enough to house. 2. It isn't a good idea to put a betta with danios, who tend to get aggressive. Since bettas move slowly, the danios might nip at his tail, and the betta won't be able to excape them. Danios are very darty and fast, and their constant movement may be stressful for your betta. In my experience, neon tetras work great with a betta, since they don't move very fast and aren't tail-nipping fish. For that you will need at least 10 gallons. The snail shouldn't be a problem, though. So if I were you I would get another aquarium. Consider a three gallon tank. Put your betta into that and leave the danios with the snail. Make sure to add some more danios to the group. Good luck, hope this helped.
Not unless you have an 800+ gallon tank and even that might be risky.