you have asked this question once and it has been answered too
no point jumping others threads and asking the same question again and again, else start your own thread or do a search there is a lot of info here
anyways, it depends on the size of the tank your fish is in and the size of the fish
what you have to remember though is to keep the water params on the low for nitrites nitrates and ammonia and you will do good
and yes doing a water change once a week on any tank you keep is a great thing for your fish and the beauty of your tank(beautiful fish + clean water = beautiful tank)
lol yeah the cats are really beautiful-especially that male! hopefully they can produce some beautiful kittens-they are worth alot of money here in the U.S.. its too bad that people will steal them, but i can see now why they are tied up. i know he only has 4 rooms in the house, but maybe he could shut them both in a room that no one can just walk into? hmmm
niiiiice LOL
yeah some do some keep 'em better
i know one more lfs guy who has only one tank and 2 real nice looking fish may be next time i will go there and get some pics of his tank