There are two main causes of beer foaming. First and foremost is temperature. Questions for you.
Is the cooler box 38 degrees F. or below?
If so, is there a tube blowing air from the box up into the tower(s)?
Is there a fan blowing up the tube? Is it working?
Check-- Use a pitcher and open the faucet. Does it foam and then clear up? This would mean the box is cold enough, but that cold air is not getting up into the tower.
If the temperature is OK, what do you have the gas pressure set at on the regulator? CO2 should never be turned up higher than 15 psi. Turning the pressure down too low will also cause the beer to foam, as the pressure cannot suppress the gas in the beer, therefore it foams.
How log are your beer lines from the tavern head to the faucet? They should be in the neighborhood of 6 ft in length ( 3/16" line). A little too long is better than a little too short.
Lastly, check inside your tower to be sure that the line is not kinked.
You should be able to use one tank of gas for all of your beers, unless you are trying to pour a 'spinner' style of beer such as Guiness or Murphy's stout. They require a higher pressure (30 psi), therefore must be on nitogen or a nitrogen-blend gas.
The lines should probably be cleaned 2-3 times per year. Should be more, but if this is for home use it probably wouldn't happen more than this. Commercially, at least every month. You can buy a brush and keep the faucets clean yourself or purchase a manual-style cleaning bottle and solution and do them yourself.
Cleaning the lines and faucets is a health and sanitary issue where beer is concerned. The cleaner the parts are maintained, the fresher tasting the beer is. That is the ideal end product.
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