Yeah actually I did a water test today. My PH seems a bit high....about
7.5

I have a LITTLE ammonia, less than .5ppm but I did a big water change
yesterday so I assume this may clear out.

I have a 0 nitrite level

I always have a hard time measuring kH and gH. I had to kind of
estimate. It looked like my kH level (tank) is in the 75-100ppm range.
My tank right now has only various tetras in it....this an ok level? My
own gH level was inconclusive. I use a test kit that's based on color
reaction and I just couldnt make a good determination. I dont know if
there are more accurate ones out there. This is the one I use:

http://www.petsmart.com/global/produ...138298228 936

At this point I was planning to get some PH down and take some water in
for a more accurate test.

Now I'm afraid I wasted money by going with the UGF!

I'm really eyeing a cannister filter...even if its freestanding....it
just seems like they have WAY more filtration power...but with a 20
gal, I dont know if it's worth it. Any suggestions about this will be
helpful! Thanks!