People like fish as pets because they are easy to take care of and watching them swim can be very relaxing. Most people who are new to keeping fish like to start with cold water fish because they are cheap and most of the different kinds of cold water fish get along with each other. Some of these fish are brightly coloured and have very fancy fins, but most of them are big goldfish. Eventually, they will switch to tropical fish to get a wider range of fish. But keeping tropical fish can be risky because the fish cost more and some of them are very aggressive and will eat your other fish.
There are more kinds of tropical fish, and they come in more colours, than there are cold water fish. Keeping tropical fish in an aquarium with other tropical fish doesn't have to be a gamble. It's not like going to a casino to play blackjack; if you do things right, there's no risk at all.
Before you buy any fish for your tank, you should first do some reading. If you read about fish, you'll know which ones eat other fish and which ones don't. It will also tell you which fish that eat meat can live with which other fish. This will make it less likely that you are just feeding one fish a lot of money.
Cichlids are a type of fish that eats other fish, but they are school fish and prefer to be in a tank with other Cichlids. You want all the other Cichlids in the tank to be about the same size, or one day you will come home from a day of playing the most popular online casino games and find all your fish dead.
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Cichlids are fish that live in shallow to medium water. This means that they will swim near the top and middle of the tank and won't spend much time at the bottom.
People who have Cichlids will often get a bottom swimmer to fill up the tank. Catfish are a very popular type of fish that swim near the bottom. There are a lot of different kinds of catfish. Some of these fish are not aggressive and don't get very big, but a fish like this might not be aggressive enough to live with Cichlids.
You might want to get a more aggressive type of catfish, but if it's too big, it will definitely eat the Cichlids. If it's too small, you're taking a chance that the Cichlids won't eat its eyes.
Just remember that each fish has its own personality, no matter how much you read about them, and that putting them in an aquarium together is a gamble, no matter how much you read that one fish will get along with another.
There is always a chance that some of your fish will get eaten. The only way to make sure that all of your fish stay safe is to keep each one in its own tank, but this won't make your fish happy. You will learn what kinds of fish can live with what by trial and error. Leave the gambling to Las Vegas.