02-17-2007, 09:10 PM
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That rule is very narrow, there are many exceptions. Heres an example, an Oscar grows to around.... 15 inches, does that mean it can fit in a 15 gallon tank? No, an Oscar needs at least 55 gallons but really should be in a 75 gallon. Goldfish are similar. But neon tetras grow to about an inch, but you can fit double most of the time.
I would suggest as a begginer is to stick to hardy species, you could even do a species tank, a 29 gallon tank with a wide assortment of different colored guppies can look really nice. You should return your fish you have now, and get some platies to cycle the tank. Once the tank is done cycling, maybe add 6 lemon tetras, then wait a week or more for your bacterial filter to take the extra, then add a school of glowlight tetras, wait another week or more. Then add a few cherry barbs, 3-6 is good.
Also to remember, platies and guppies are livebearers meaning you should have a ratio of 1 male to 2+ females, so if you have two males, you will need at least 4 females although 6 is even better.
These fish wont mind a bit of current from your filters and air pumps but i dont think you will need a powerhead for them.