08-14-2008, 08:40 PM
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Yep...definitely do some research on the aquarium cycle. If you added all of those fish to a 20 liter tank that had just been set up, you've probably got huge amounts of ammonia in there. Get yourself a good liquid test kit (like the API Freshwater Master Test Kit, not the test strips). This will allow you to test the water to see when your ammonia (and eventually, your nitrite then your nitrate) become too high for your fish to bear. Since ammonia and nitrite are both highly toxic, you should do a water change every time either one goes above 0.25 ppm.
I'll be straightaway honest with you - you're going to have a lot of trouble with that stocking list in a tank as small as yours. The guppies are a good choice, as they stay pretty small. If you get mixed sex guppies, you can look forward to having tons of baby guppies to deal with in the future that will eventually overrun your tank unless you find someone else who wants some of them. The dwarf gouramis are very territorial fish. Almost all of the ones sold in stores are male and will not get along with one another. I wouldn't be surprised if they attacked other brightly colored fish, such as the guppies, either. The sucker catfish are also likely going to be a problem, unless they are oto catfish. Most other common "sucker" catfish (there are a huge variety, so a picture would be helpful) are either Chinese algae eaters, which get to be 6" long (although I've heard of them reaching a foot) and get very aggressive, or they're some sort of plecostomus. Even the smaller pleco species still reach 4-5" and will produce much more waste than your small tank can handle. Many plecos are just common plecos, which grow to at least 18" and need a 75 gallon tank. Your mono is a brackish water fish that can't survive in freshwater. It will also eventually reach 8" in size and need a fully saltwater tank.
Hate to rain on your parade like that, but whoever told you that those fish would all get along in a 20 liter tank was completely bonkers.