"Tynk"... I guess unfortunately, I have always replaced the biofilters
(every 3-4 weeks). I had never heard of rinsing them in old tank water.
The tank is slowly starting to uncloud now. The tetras I have are gold xray
tetras. I had 5 of them going back to three years or so ago, slowly they
died off, usually from the body curving (not sure what causes this) or by
getting something similar to a dementia (can't swim straight or at all
anymore). So right now I have two left. Then along with the angel and two
corycats, its a nice peaceful tank, I feel plenty of room for the angel but
I'm no expert. The angel's body is about 3" diameter. Here is a photo I
just took of the angel this evening (photo came through nicely through the
"cloudy water"). He/she is going on three years old now. Very pretty
coloring, lots of personality (some people think it is nuts to say a fish
has personality or recognizes you).

http://www.knack.com/angel.jpg