Likely the problems do stem from your tap water. RODI is definitely the way to go and even if you can get your hands on some water from the purified water store it will definitely reduce the nutrients in the tapwater that are possibly fuelling your algae. In the meantime, the 20 gallon water changes are definitely a good place to start. If you can afford to do larger water changes they will certainly help as well, that way you can dilute out as much of the nutrients as possible.
What do you have for circulation? The purple slime algae seems to like areas with less water movement.
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