I do 20% every week with my 46G. I typically vaccuum and do half of the tank one week and half the next week.
Hasn't been mentioned yet but be careful doing water changes if your fish are easily stressed - until they get used to them, they should be as quick and gentle as possible. Otherwise doing something that should help them may actually be hurting them.
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46G Bowfront: 1 large snakeskin gourami, 1 blue gourami, 2 pearl gouramis, 12 black neon tetras, 4 panda corys, 1 albino pleco. All gourami's are female as far as I know.
Lighting: 78 Watts (1.7 wpg) T5HO
Plants: Java Moss, Flame Moss, Marsilea Minutia, Marsilea Quadrifolia, Staurogyne sp., floating Myrio Simulan.
Substrate: 80 lbs Eco-Complete.
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