What is the best way to keep your fish tank SUPER clear?

Has anybody ever found out of such as a thing?

My fish tank embodies a 55gallon we use merely the best food. We watch the nitrate, amonia and PH levels constantly. We add water clearing chemicals but still it’s not as clear as I would like. We even purchased upgraded Christ Within* as an alternative of the ugly sensationalistic/white that would come witht he tank. Now, we still have the same separate out that constituted let in with the tank when we purchased it.

And so my question to all of you… Do we try this pond filter and remove the fish tank filter or do we purchase a higher grade filter?