Topoff or Waterchange?

[iceburger]

i top off my tank once a week (small tank) and do small water changes every two weeks, what is the difference of topping off a tank and changing the water, doesn't the evaporation of the water pretty much do the same thing? or does it only take water and not toxins...

 

[javajoe]

with water chagnes, you are getting rid of toxins, etc. With evaporatoin and top offs, you are only getting rid of pure water-- leaving salt and toxins. relying on evaporation to do you watere changes will result in a higher and higher level of toxins in your water unless you have some method of nutirent export (refugium with culerpera, etc).
If you wait for it to evaporate, THEN do a water change, and use salt water to get the level to where it should be, you also will increase the salinity.

 

[plum70rt]

For me I have not done a water change for about 7 months now, I do Topoff a gallon and a half a day, of RO/DI water, this works for me so far with the denitrator running,

 

[iceburger]

do have pics of your setup plum???

 

[plum70rt]

Sure , what you think?

 

[iceburger]

oooooooooooooohhhhhhhhhh...
suddenly my new 75gallon seems a bit wimpy