QUOTE(crazymouse_yyh @ Nov 21 2006, 01:19 PM)
Hmm.. this inspires me to try again. 1 question.... I think my aquarium is contaminated... well, now no fish lah coz once I bought 10 guppies... all died in 1 week.... my uncle said it could be contaminated so he advice to wash the whole tank with mild bleach... got any better way to do it? How about the gravel? Wash with bleach also? I am guessing it could be the filter coz it has been running for 5 years already..... those cheap rm20 fliters... should change right?
what was previously in the tank?
and why would you want to bleach your tank, gravel and such. cos if it was running all these years, then the helpful bacterias are ready there.
fish don't die so easily, but without detailed information on your tank it's difficult to advice the course of action.
filter yes, of course must change but then it's not so bad until can kill off 10 guppies in 1 week. if could be the guppies being bad stock. it could be that they were stressed in some way.
there's many other factors to consider, not just "contaminated" tank. perhaps you can ask your uncle why he said it was possibly contaminated.