Water changes

[marie]

I'm mostly just curious but everytime someone has problems with their tank and water changes are recommended they are told never change more then a 10%-20%.
Every water change on my smaller tanks (50g), I change out 50% and never had any problems what so ever. I'm not even that precise in matching salinity although it is usually close.

How many people have actually had bad things happen if they do a large, say 50% or more water change? I don't mean when the bad batches of salt were around or when you are changing salt brands. I mean regular everyday water changes, when you've used salt from the bucket before and know what the cal/alk is.

A large water change makes so much more sense when you are having issues and yet everyone recommends lots of smaller changes which takes twice as much new salt water to reach the same goal

I think I should of made this into a poll