new filter (have some questions)

[jemma21]

i did a 100% water change last night and today i went and brought a filter.
how often should i do water changes? and how much water should i change.

i'm guessing that when i put new water with old water it still has to be treated?

[jemma21]

so when i got home i set up the filter in sushi's tak switched it on and bless him is was being blown around the tank by the current!!! (and it was on the lowest setting!?)
i have had to switch it off as not to stress him out anymore than he already is.

he is in a 2.3 gallon tank should i buy a bigger tank mabe a 4/5 gallon tank so he doesnt get blown around by the filter?

TIA

[vaygirl]

Check out this thread, it has modifications for slowing your filter down.
http://www.bettafish.com/showthread.php?t=29030

[iheartmyfishies]

You should be doing 20%-50% water changes weekly. A gravel vacuum and a bucket helps A LOT! And yes all new water must be treated. The modification above should fix the high current problem.

[jemma21]

this is the filter i have. should i put a pair of nylon tights over the bottom part of the filter? i'm guessing thats the intake part?

http://www.petsparade.co.uk/aquarium/filters/?p=4065

thanks once again!!