Re: 55 gallon tank
You have a mixture of tropical and cold water fish, which won't work in the long run. The gold fish and minnows would be a cold water tank. The others require tank temps to be somewhat warmer than what the goldfish need.
First you need to decide on which type of tank you want then go from there. In a community tank I would go with tropicals. Or you can have just a goldfish tank.
In a tropical tank you can have an angel but you will need to up your numbers of the tetras and barbs to at least 6 of each. As they can be pretty bad at nipping fins. The neons will make angel food once the angel gets full grown.
The plecos if they are common plecos they will get 18 to 20 inches and your tank isn't big enough to house them. I would trade them for a couple of bristlenose plecs which ususually max out at 5 inches.
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