Don't forget to match salinity and temperature before adding the new water!
Your filtration questions: are you using live rock? Canister filters are more a FW
thing, I think. Most people here use live rock as their main source of filtration . . . any filter media (sponges, bio balls, those little carbon/filter inserts) may increase the nitrates in your water more than they help. (There's debate on this, as with just about everything in SW
as I'm learning. Well, everyone agrees damsels are mean.
tank with 29-gallon sump
2x Maxijet powerheads
Mag drive 9 return
Coralife 4x65 Lunar Aqualight
120 lbs rock from liverocks.com
1 peppermint shrimp and 1 fire shrimp (very shy)
2 black Ocellaris, Squish and Smudge
3 chromis, too identical to name as yet, in QT
29-gallon with two goldies, Carrot and Orangehead