spyke;4006938; said:why exactly is a 100% water change so bad? bacteria is in the filter not the water it self...i see no problem with it...he changes the water so ofter, why not change it all, it causes no problem especially if he has a place to store the fish for about a day or 2...or even less time.
Yes you do have bb in your filter but you do also have bb in your tank. The bb in your tank is on your substrate, decorations and all that good stuff. You are killing off a large amount of it by doing a 100% water change and that is a very bad idea. If there are not fish in the tank and you wont be putting fish in it for awhile it would be better to tare it down and re-start the tank and let it cycle...(basically drain the water and use the bb from the filter to give it the "help" in starting the cycle or you can start completely fresh and new). just keep the lights off and slowly re-introduce lighting to the tank and see how it goes, if it starts to come back keep the lights off and treat it as you see fit, chemicals or non-chemical. If you still have fish then I would just try keeping the lights off and water changes, the uv light is also a good idea. If that doesnt work then the chemical previously mentioned should help and is meant for aquariums.