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Do your self a favour and get cichlids. I have tried most but they seem to be the hardiest of the tropical fish.
I have had most tropical fish (except discus waaaaay too much work) and the cichlids are very colourful, active, interesting breeders and extremely hardy. They do not mix with many smaller tropicals though. My advice:
Get the biggest canister filter you can.
Get 2 larger bristlenose catfish (they clean your tank for you).
When setting up a tank try to get some water from somebody elses tank, it has bacteria that you want to prevent new tank syndrome (ammonia and nitrite poisoning).
Cichlids are pretty tolerant to ph changes, my town water supply is the perfect ph, so I dont have to check the PH anymore, it always right.
To answer the question about betta's (siamese fighters) males only have the longer fins, the females are quite boring. They are tolerant to cold water but they dont move much when they are cold. They also breathe air so they do not need a lot of water around them (to absorb O2), but they must have access to air above.
My .02c
Kids love fish, my tank is like a tourist attraction to kids!
Brett
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