Congrats! My nitrates went from 40+ to 0 in less than a month when I added my 55 gallon fuge...
Now, one comment - you seem to be interchanging the terms "sump" and "refuguim"... A refuguim can be a part of a sump, or a stand alone tank/area, but sump is not = refuguim... Just wanted to point that out...
As far as water changes, mainly a matter of convenience... I usually do water changes by shutting off the flow to my 55 gallon refuguim, draining most of it, then filling it back up with new water, then turning the flow back on to it, but I've done water changes from my main tank too... (Can't do 'em from my sump, since it's only a dinky little 20 gallon tank... :wink: )
Now, one comment - you seem to be interchanging the terms "sump" and "refuguim"... A refuguim can be a part of a sump, or a stand alone tank/area, but sump is not = refuguim... Just wanted to point that out...
As far as water changes, mainly a matter of convenience... I usually do water changes by shutting off the flow to my 55 gallon refuguim, draining most of it, then filling it back up with new water, then turning the flow back on to it, but I've done water changes from my main tank too... (Can't do 'em from my sump, since it's only a dinky little 20 gallon tank... :wink: )