Originally Posted by bettaman12
I am sorry. I should of worded this more carefully. Rarely be done in a cycled tank. This is because I have done it before without knowing the consequences. I thought that all tanks needed biweekly 100% water changes. I knew that Beneficial Bacteria live on all surfaces in the tank(which is what is right) I thought that doing the change wouldn't harm anything. I had just finished a fishless cycle. It was a HASSLE taking out the fish and putting them in containers. Then, I removed the tank water. I lugged buckets back and forth to refill the 10 gallon tank. I filled it with dechlorinated water. I then had to wait for all of the fish to reacclimate to the new water temperature. Then, about 3 days later, I started to see signs of sickness (which I did not know what they were at the time) I tested the water and saw that the ammonia levels were too high (above the normal levels of 0). I was shocked as I thought that my tank had been cycled. Turns out that my ph levels, hardness levels, and ammonia levels in my tap water had changed. I guess my city had been adding ammonia to the tap water recently, and along with my partial water changes, that level had built up. I didn't drip acclimate my fish. One of my fish died
but the others eventually were treated but I was just trying to say that 100% water changes are way too much of a hassle. There is no need for them in a cycled tank, unless you like all the extra work!
(Unless nitrates are severely high!) I do know that BB lives on aquarium surfaces, and not in the water column.
That sounds like quite a headache! And a lot of unnecessary work. I agree with you, that a 100% water change on anything other than a betta tank is a giant PITA, and that there is no need to ever do that in a community tank unless there is some catastrophic contamination. It's just unnecessary to remove so much water that the fish need to be removed.
Too, it takes a long time for chloramines to dissipate - significantly longer than chlorine.