Hi kmercado,
The only rule on water changes is that the more the better. I like to do a 10%-15% weekly change. Of all method of nutrient/toxic export, there is not a surer way to accomplish it than to change out some water. That said, there are many reefkeepers who do them less frequently with good results. With only a 20 gallon replacing 3 or so gallons each week is neither expensive or time consuming so why not do so?
I agree with Alex that housekeeping is not a major issue. If you have a DSB just siphoning off the gunk at the top of the bed and cleaning the glass should do. If you go the barebottom route then overall cleaning of the tank bottom should be a frequent practice.
The only rule on water changes is that the more the better. I like to do a 10%-15% weekly change. Of all method of nutrient/toxic export, there is not a surer way to accomplish it than to change out some water. That said, there are many reefkeepers who do them less frequently with good results. With only a 20 gallon replacing 3 or so gallons each week is neither expensive or time consuming so why not do so?
I agree with Alex that housekeeping is not a major issue. If you have a DSB just siphoning off the gunk at the top of the bed and cleaning the glass should do. If you go the barebottom route then overall cleaning of the tank bottom should be a frequent practice.