Everyone will probably do things differently, but here is a list of my Maintenance Guidelines.

Daily Check:
Livestock
Temperature (Log)
Water Level
Flow Rates
Skimmer

Weekly Check & Log:
Nitrates
Alkalinity
pH
SG
Top-Off
Clean:
Glass, Lid, etc.
Skimmer Cup
Water Change:
5-10%
Vaccume 1/2 Subsrate
Stored Water:
Mixed Salt Water
Top-Off Fresh Water

Monthly Clean:
Aquascape
Refugium
Pumps
Filter Foam & Bucket
Rotate Part Carbon
Check:
Equipment
Wireing
Log

6-12 Months Equipment Maintenance
Check Lighting
Clean/Replace Substrate