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Otherwise this is all great info. Is that your tank that you posted a pic of?
I was also curious about putting local lake fish into the aquarium. I was thinking blue gill as well or some sunfish and setting up the tank to resemble a river bed or the drop off point of a lake.
I'm not too aware of english sites, so my first recommendation would be to go to a library and check out all the books you can find on the subject. Just note that especially older books often have quite ridiculous space requirements for fish and some of the data is outdated, though it happens on some newer books too. But after a quick google I found two pages that make a good reading and help to understand the way an aquarium works. One of them covers the nitrogen cycle and can be found here Link Removed and one of them is more overall and can be found here http://animal-world.com/encyclo/fresh/information/freshwater.htm The latter one seems to contain some ads, sorry about that.
Some descriptions of most common fish and plants can be found at Invalid Link Removed But I have to mention that personally I disagree with some information given on this site. A lot of it is good, but I wouldn't trust it as absolute truth. The space requirements are well off in many cases.
These cover mostly freshwater aquariums which is a more natural choice for beginners as it's a lot less expensive and in some means more forgiving. If you ever think about taking the plunge to the deep end of the pool, reefcentral.com will have all the answers. But reef aquariums aren't cheap at all. Actually, a 100 gallon reef tank can easily cost as much as a Fodera bass if it's taken to perfection. And the electricity bill can compare to keeping a hummer fueled.
And then some pointers: it's always better to understock than to overstock. The most common reason for having problems with aquariums is usually having too much fish in too small tank. Understocking will result in healthy fish with normal behaviour, overstocking will result in excessive maintenance, diseases and loss of territorial behaviour (or just an all out war).
Overfeeding is the next most common mistake. Many cans of fishfood say that give as much food as fish will eat in a few minutes a couple times a day. I'd make it give as much food as fish will eat in twenty seconds and a minute or two for bottom feeders depending on the species.
And always get as big of tank as you can afford and fit. Larger tanks are more forgiving, allow way more species and are usually easier to maintain. I wouldn't recommend anything below 20 gallons for a beginner, around 40 g or bigger would be a safer bet. Smaller tanks are a lot more sensitive and quick and possibly lethal changes in water parameters are more likely to happen.
Also avoid all calculations like so many gallons can hold so many inches of fish. That stuff should've died in the '80's and can lead to a disaster. With small and peaceful community fish it might work, but if you consider anything larger or predatory those calculations go straight out the window. The real space requirements are determined by the swimming patterns, habits and diet of fish.
The compatibility of differend kinds of fish is a hard subject. The pH, temperature and Gh are the first things to take into consideration but after that there is still the questions of attitudes of differend fish, the level of aggression and wether they are predatory or not and so on. In the beginning, your best bet is either to copy a well known working combination of fish or to ask for help.
I know my english sucks, but as a professional aquarist and a bassplayer I'll be happy to answer any question if you have them. Mind you that my freshwater knowledge might be a bit rusty on some subjects.
Some white cottom like particles in my tank. Can it be reproductive material?
Some white cottom like particles in my tank. Can it be reproductive material?
If I was to release my gold fish and put the betta in the 20 gallon tank, what would be a good tank mate for the betta, and how about what is a good tank mate for the goldfish. I wanted to put a bluegill in there.
Are you talking about releasing the goldfish into a lake?
Also, in most states, catching wild fish for a home aquarium is illegal.



lol, I almost got one of them today for my daughters tiny tank...but instead got two kissing goramis..(sorry if I spelled wrong).
Are you talking about releasing the goldfish into a lake? That's illegal and can cause big problems for the lake. Goldfish and carp are the same, and look at all the problems with carp.
Also, in most states, catching wild fish for a home aquarium is illegal.
People do it, just sayin'.
And if you end up putting down a fish, some tricks used in the 80's should be avoided. I've actually seen books recommending dropping fish into boiling water. It is a horrible and painful option for the fish and can cause severe burns on a human doing it too. The fish can be put down with anesthetics, but such products like MS222 aren't available for consumers. So far the best option for home aquarists is unfortunately a hammer to the head and enough force to make sure it's done with one bang. Sounds bad but a responsible fish keeper sometimes has to do nasty things.