build up on tank sides

we have two fish in a tank that is 1" x 2" x 1.5 not sure how many gallons
it has a filter appropriate to the size of the tank according to the local
"pets at home" after a few weeks a greenish scum starts to build up on the
sides of the tank. I change the water about once a month. I put tap water
conditioner in and allow the temperature to equalize before I put the fish
back.
Am I doing something wrong.
On another note one of the fish is about 8 years old.....the other one about
6 years, how long do these things live. the thing is virtually silver now
which I assume is the goldfish equivalent of going grey

On Apr 23, 4:45*am, "Rob" wrote:
we have two fish in a tank that is 1" x 2" x 1.5 * not sure how many gallons
it has a filter appropriate to the size of the tank according to the local
"pets at home" after a few weeks a greenish scum starts to build up on the
sides of the tank. I *change the water about once a month. I put tap water
conditioner in and allow the temperature to equalize before I put the fish
back.
Am I doing *something wrong.
On another note one of the fish is about 8 years old.....the other one about
6 years, *how long do these things live. the thing is virtually silver now
which I assume is the goldfish equivalent of going grey

Well by my calculations thats a total of 0.01298701 USG, which IMNSHO
is much to small for a fish except perhaps a newly spawned fry. 3
cubic inch tank must be a piece of caKe to do water changes in but
hell in keeping water temps within reason.

First off you need to make up your water in a separate container, not
in the tank itself, and once a month is too long between water
changes. ONly a few things that cause algae, over feeding, too long
between water changes too much light too high of a bio load. If these
are goldfish they are in a tank that is much to small for them and
odds are your filtering only to what tropicals need to be filtered
toop. Goldies are a whole other ball game and require much more filter
power than tropicals do.....

sorry should have been more specific....it's feet

"Tynk" wrote in message
...
Are you sure on that measurement?

1" x 2" x 1.5? feet or inches, or did you really goof up on the
measurements?


Hey ... Tynk the Twink obviously t(h)inks that EVERYBODY is
as dumb & stupid as he is !?

Hehehehe !

Poor kid.

Tynk ... the kind of dumbf*ck that walks into a hardware store & asks
for a menu.