I'm not in Woodbridge so my answer may not be what you're looking for, but for most of my fish, I do not filter what comes out of the tap. The pH of my water most of the year is 7.6 which actually is fine for Mbuna. We've had a few speakers come to our club mention that those lakes range anywhere from the mid 7s to mid 8s and point out that our water in the DC area is great for Rift lake cichlids as is. That being said, I do add some Epsom salt and baking soda in some of my Malawi and Tang tanks at the same time that I add the dechlorinator as I refill the tank. I have found that I prefer to add it to my breeding tanks, but not my grow out tanks. Those get just tap water with dechlorinator.
The only fish that get filtered water are some Westies, some Apistos and some catfish.
As for tap water contributing to algae blooms, that has not been my experience so far. Have you tested your tap water for nitrates and phosphates? Those would be the two biggest culprits. The nutrients are usually introduced into our tanks in far greater quantities by the food we feed them.