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Is there something that "changes" the water in the tank? My tank is 90L and my RES 7inches.

what do you mean by "change"

There is a device called a Python that's a very long plastic tube that you can attach to a sink faucet. It can be used to both drain a big tank like yours (into the sink) and to refill it. Didn't you say you live in Greece? I'm hoping it's available to you there. Here's a link that describes it. It's available at all major pet stores and on-line suppliers around here.

http://www.pythonproducts.com/aqprod.html

If you can't get a Python, you can get a simple syphon (let us know if you're not familiar with this device), drain the water a few gallons at a time into a bucket, then either refill the tank with the bucket or run a garden hose in from outside to fill it.

Thank you but I think I will get a better filter because the one I hane now is not so good. Do you know something good? Is this good?
http://trade.ferplast.com/en/pagina_328797.html

Her name is Calypso (passion with mythology). She has a little pyramiding.

Aggelos wrote:Is there something that "changes" the water in the tank? My tank is 90L and my RES 7inches.

hey hey

Even with a wonderful filter you'll have to change the water from time to time. With a good filter you just won't have to change it so often. I think most people with good filters and tanks that are right-sized for their turtles do partial water changes every few weeks and change most of the water every month or six weeks.

With even a good filter, a byproduct of turtle waste breakdown (nitrate) will build up and it stinks. A good biofilter will neutralize harmful waste products like ammonia but not the nitrate. Also, as nitrate builds up algae will probably start to grow. A little algae is fine but too much and you won't be able to see your turtle in the tank!

The only practical way to get rid of the nitrate is to drain some water.

What filter should I buy? What do you use?

Most of us in the U.S. use the Rena XP3 by Filstar. I don't know if you can get it in greece though.

This is the filter...
http://www.drsfostersmith.com/Product/P ... 2004&Nty=1

I use a magnum 350 & seems to get the job done well.

Here's a link:
http://www.marineland.com/products/cons ... magnum.asp

I'm on the Eheim wagon. Works great

http://www.eheim.com/index.htm

I use an XP3 and love it.

90L is much too small for your turtle. At 7 inches she should have about a 270 L tank.

I thought it was 10 gal per inch of shell.. With that rule the turt can stay in that tank till he is 9 inches.. Right?

90L (litres) is about 23 gallons...

It would be better to think of it as 10 gallons of tank per inch of shell length.