I highly recommend that you put live rock in your tank if you have not done so. With live rock, there is no need for a canister filter as live rock offers the best biological filtration you can get. Also, you could add a sump to your system. They are usually tanks or rubbermaid containers put under the tank stand and are used to hide equipment such as heaters, protein skimmers,etc. and to make your aquarium more stable because of the extra water it can hold. You could also put live rock rubble in it to make the bacteria population even higher.
And try doing searches about this topic as it has been discussed many times before.
HTH
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