MD> Now that I've disassembled everything and cleaned it, etc.. I want to 
et
 MD> the tank back up.. Any recommendations on what to populate it with? I'd
 MD> likely just replace what was there before, but if any 
 MD> one has suggestions on interesting/colorfull fish that I could get  MD> 
instead...
For starters, the undergravel filter you mentioned is a very good idea.  
Also, NO GOLDFISH!  Not only do they pollute the tank, but they prefer the 
water significantly colder than your tropicals, so the goldfish didn't like 
it either!  Anyway, I'm real partial to Black Skirt Tetras.  They add a lot 
of contrast and movement.  And they can live through just about anything.  
I've also had a lot of luck with Giant Danios.  Tiger Barbs are great, but 
they're fin nippers.  If you get them, you need to get 4 or 5.  If there are 
enough to school, they play tag with each other.  If there aren't, they nip 
at the other fish.
You might also consider getting some water testing kits.  They will help you 
monitor the specifics.  There are several ways the water can go bad, and 
treatments differ depending on the problem.  And most important, remember to 
set your tank up and run it for a week or so before you add the fish.  This 
allows the chemicals to recah a balance.  Then add the fish just a few at a 
time so your levels don't spike.
Good luck, and let us know how it turns out!
Robby
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