currently using tap water for my fresh water tank. Problem is i have an soft water system for total house.I would like to have control over water chemistry.any one using ro unit can tell me if this a good idea ? any insight would be welcomed

What is it you're trying to do, using a RO system? I wouldn't use one personally if there wasn't some purpose. Also, if you have a water softner for the whole house you should bypass it for your aquarium water.

I use a RODI system to take down the kh/gh of my water for planted tanks and better CO2 usage.

alot of RO's are used with a water softner. I use RO systems and looked into one as well but the cost to add the softner was unneeded at the time.

Reverse Osmosis System vs. Water Softener | eHow.com

with a planted tank I would not treat the water in any way.

With some peat moss in the substrate and by not doing water changes you should be fine without the RO.

but then I don't use RO so couldn't tell anyway.

my .02

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fw leiden since 1979, fo salt since 1979, mixed reef 55g 2002-2009. Strong emphasis on the tank taking care of itself. Balanced with plant life, no water changes, tap water, no filters in FW. Only dosing calcium, alk, mag in marine reef tanks. http://www.aquariumforum.com/f15/my-...ods-26410.html
recent tanks (till 2009) 7 years- 10g FW leiden 7 yrs, 55g mixed reef 7, 2 yrs, 20g FW leiden, 10 g fw leiden , 29g mixed reef, current tank 55g leiden

my kh is high phosphstes are over 40ppm have loads of algae

my kh is high phosphstes are over 40ppm have loads of algae .no way to bypass system outside of turning system off