i wonder how often do u have to change water and how much do u have change? I have a 55 and i fill about 5 gal. every 2 weeks cuz of evaporation. My friend never change his n his is fine????
Water replentishment from evaporation is not considered a water change. This does nothing for the quality of your water. You need to do salt water changes on a regular basis for the benefit of trace minerals replentishment and overall water quality. It will remove building nitrates as well.
The basic idea behind regular water changes is very simple to me...the idea is to dilute pollution via dilution....and each water change will replenish trace elements. Just makes sense to me to remove and replace a small percentage of the system water on a regular basis. Top off is much different and is basically to maintain the established water volume and salinity level.:thinking:
It depends on what you have in your tank. If it's fish only 25% every three weeks is probably okay. If your keeping softies, corals, inverts, etc., you should do a % at least every week.