I have a lightly planted shrimp tank, primarily slow growers, that has been doing pretty well since June 2015.
I use very light ferts at water change only. Seachem Florish (2ml per 5 gallon of RO) and I change about 10% every week in my 12 gallon.
ControlSoil as buffering substrate.
August post has full tank shots:
http://www.plantedtank.net/forums/12-tank-journals/947458-12-long-slow-56k-warning-2.html#post9466401
Initially I was dosing 1ml/5Gallons and tank was running out of nitrates (nitrate deficiency showing on the Anubias) so I bumped it up.
I still get regular berries and tank seems very stable.