Not unless there is really something crazy going on with my batch, I do not add water to a batch after it is already fermenting. If you hit your target OG then the volume losses are just that. A loss. Just remember you have 4.5gl instead of 5.5 when you prime for bottling (if you bottle that is).
Drinking Oaked Wee heavy, The Kaiser clone, Graff, , Sour Cranberry Ale
Carbing/Aging Westy 12 (2013),
In the bucket Chocolate stout, Westy 12 (new world)
On Deck Pumpkin Ale 2014, FBS clone, Port oaked amber, Old Rasputin Clone, 15% RIS