i have 2 of those bio wheel filters and i do a water change every 2 weeks, and on the chat for the test is was either 1 or 2 the colors were real close
ok i have had 2 of these silver sharks for about almost a year and i have never had any problems with them at all untill i got a new one, ( I think? ) is he alot smaller then the other 2, i got him becuz alot of ppl have said they like there own kind around them, so anyways i change the water...