it's tropical, my filter broke so i am getting a new one, not sure wheather to ger a stronger one or a weaker one, there is none my tanks size, if I get a stronger one what fish would be able to cope with the strong current it would make?
A stronger filter would be ok. It's just the current in the tank that would be the issue. So i suggest some Guppies, Gurami or Goldfish. I believe that It is one inch of fish for every gallon the tank is. So if the tank is seven gallons than you should only put seven inches of fish that includes growing room.
fancy guppies!!! you could easily start a guppy colony even if u r a beginner. they dont grow that big and the miracle of life is an amazing thing to watch.