THe more evap the better IMHO
, that's just more fresh water going in. I just use a fresh water bucket and siphon in my topoff water with a piece of airline tubing. (cheap and easy)
One of these days I'm going to hook up an automatic RO
topoff system with a kalkwasser doser (pickling salt water) and then I won't have to worry about it
I use blood worms all the time in this tank along with mysis, flake, frozen copepods. I do not think they are a problem.
I am not sure why, but sometimes you hear of evaporation as a "problem" and suggestions to close off the tank with a glass top and stuff ensue. I think it's a real blessing and I keep the tops of my tanks as open as I can. You get better gas exchange and the whole evaporation thing is just not a negative issue to me.
In my 70FW I add 5 gallons a week or more.
Also depending on what stuff you're raising in your tank (reef) you can add a little pickling lime to your makeup water to up your calcium levels and stuff, this is what kalkwasser is, I am still learning about it. It inhibits growth of micro/macroalgae a little I hear, and is good for corals and such.
I will see how my razor caulerpa responds to kalk
here pretty soon to see if it grows slower (it grows slower than most caulerpas anyway) .
Hope that helps a little I am still learning too.
And by all means ask/post away, I post on this site constantly, I think it is because I feel like I'm in a family here.