how much is too much

so with all the talk about how everyone changes water in their systems, how much is too much ? As i do 20 gallons a week. so am i messing with the bio diversity of my system?
I always thought that wc's are done to replenish as well as rid ur system of wastes. my over all system volume is 240 gallons and I change 20 a week so is this too much ?

 

That's just a bit over 8%. I see no problem with that. I do weekly wc of 20%, but I might lower mine down to 10% weekly.

 

I do 20-50g a month depending on my mood lol.... Generally around 30g a month though. It really I gage it out things are doing in the tank. Or if ive been over feeding as of lately.

 

I use to do ~20% (25g) WC bi-weekly. But lately I've been busy so I've been doing ~30g/monthly and I don't see any difference in my system/parms (negative nor positive).

 

Antdizzle - your inhabitants will be the best judge of your water change quantity and regularity

does not sound to much to me , if my tank was 240 gallons, I would probably do the same as its an easy and convenient number ( having 20 gallon brewers bucket myself and 5 gallon water dispenser bottles that have my RODI in )

Steve

 

If you are really worried I would use high quality salt mix like bioassay and I wouldn't worry about it.
I already said my view in the other thread that any damage from WC(excluding large ones that swing parameters) comes from heavy metal laden salt mixes.

 

most def they will. Im always looking and seeing what up. have had some die off on few things but nothing super duper bad.