Nova Aqua + is a reasonably priced water conditioner that can be used to detoxify Chlorine/Chloramine in your Tap water.I tend to use it on the ten gallon and under tanks.Measuring it out is pretty simple. This product contains both Vitamins and adds Electrolytes needed for proper Osmotic balance.Now I can't swear on that,but I can tell you that I haven't lost any fish during the water changes.
Would I recommend it?Yes,I've been pretty happy with this product.

Pros: use in smaller tanks/easy to measure

Cons: none

Novaqua is great any time you are performing task that might stress your fish. You will notice a marked increase in the survival rate by using it.

Pros: A must have for anyone with fish.

Cons: None