Aquarium Tropical Fish Pictures

Freshwater Fish Photos & Profiles

The choice of freshwater aquarium you plan to set up often begins with the choice of tropical fish species you would like to keep in it. Besides personal preferences, there are many other important issues to be taken into consideration: each fish's adult size, behavior, water preferences, feeding habits, compatibility with other species, and more. In this section you can appreciate beautiful fish photos taken either by me or by friends from the net, representative of the many thousands of species available in the hobby. But you should also pay attention to the information in the tables, since it will help you decide whether that fish is appropriate or not for your existing or new aquarium.

Most freshwater fish sold for aquaria are

by ibbica

*tropical* freshwater fish, so yes they need a heater to be happy.
Minnows are coldwater fish, mollies and dojo loaches are somewhat flexible in their temperature requirments, and neon tetras are tropical fish. Not really a tank I'd set up myself, as it's impossible to maintain the 'ideal' conditions for each species.
I'd suggest looking up the optimum conditions for each of your species, and probably split them into at least 2 separate tanks. Note that 'optimum' isn't the same as 'survivable'.

If nitrates are high, yes live

by ibbica

Plants should help. They don't work instantaneously, though...
Goldfish are very different from other freshwater fish, they need colder water (higher O2 content) and are FILTHY creatures (need lots of plants or other filtration).
pH going crazy stinks. Did you check your source (tap? well? rain?) water at all?
Brand new gravel may cause problems, if the beneficial (ammonia-eating and/or nitrite-eating) bacteria were living on the 'old' substrate.
What sort of filtration system do you use? Mechanical (sponge) or chemical (charcoal or other)?
Most plecos are tropical species, whereas goldfish are coldwater species. Temperature inconsistencies could cause problems as well.

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