The best ways to minimize odor is to be really good about cleaning.
Partial water changes at least once a week are a must. Never change all the water.
Also, make sur your filter media is clean and add some fresh carbon, Carbon takes odor and color out of the water.
It is important to identify where the smell is coming from. Does it come from the water? Or from the filter?
If you have rocks or other kind of decoration on the bottom of the tank you might want to consider getting rid of it as it can trap debris and lead to a smelly tank.
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0.1 Bearded dragon
0.1 mexican kingsnake
1.0.2 Leopard Gecko's
0.0.1 Rose Hair Tarantula
1.0 BTS
0.0.1 Reverse Okeetee Corn
0.1 Bullmastiff
4.1 Cats