If you are concerned about over vaccing then do a heavy vac one week (or when ever you do your w/c) and do a light vac the next time. Or as emc7 said, only vac half of the tank at a time. If you are getting a lot of gunk everytime you clean then the heavier cleaning won't hurt and will probably do good to keep the nitrates down but if you are only seeing a little gunk each time then you can cut back on the vacs.
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Fish are people too!
My animal family
Dixie - Boxer/Lab
Peanut -Chihuahua
Cali - American Short-hair Cat
B.B. - Parakeet
Flower - Western Ornate Box Turtle
Newly Aquired
Cosmo - Rescue kitten
Loki - White Ferret
Odin - Brown Ferret
Aquariums
55 gal tropical Fresh Water -14 various fish
29 gal tropical Fresh Water - 4 various cichlids
20 gal tropical Fresh Water - 5 skirt tetras, 8 zebra danios, 2 cherry barbs, 1 glass catfish, 1 rosey minnow, 1 corydora, 1 ghost shrimp.
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