Originally posted by xnikki118x
IMO, there is no system that won't require water changes. Sure, they're not as crucial in a 200 gallon tank as they are in my little 29 gallon, but they're still important.
Like bobby and NM reef said, water changes do help replace trace elements that have been consumed by the organisms. Now some people might argue that you can supplement trace elements, and you can, and I have supplements that I add, but I still do weekly or biweekly water changes.
Also, you don't need to vacuum live sand, but my tank has crushed coral, and I vacuum it whenever I do a water change to keep the waste and nitrates under control. So that's another potential problem, also.
No matter how much filtration you have or how good or state-of-the-art it is, a home aquarium is still a closed system. The world's oceans have unmeasurable volumes of water. A 400 gallon saltwater tank is quite impressive, but if you took 400 gallons of water out of an ocean, it wouldn't make any difference because it's such a miniscule amount by comparison. A 400 gallon aquarium is still a closed system, and no filter is perfect.
Like NM reef said, dilution is the solution to pollution. :yes:
Exactly my point on water changes... I was trying to prove a point.... In the new hobbyist forum you have a person stating that water changes aren't needed and he advised a person that with the proper filtration setup you don't need too!!!!! BULLSH**.......I do small weekly water changes and not a firm believer in all those trace elements that are being used though.....
I do have to strongly disagree with the above statement about not having to vacuum live sand... That is definitely not correct...A sand bed has to be maintained isn't a a plug and play feature here...A sand bed must be maintained... It doesn't have to be vacuumed, but should be occasional stirred but the entire sandbed should not be disturbed all at once......