Also expensive and there aren't really any UVs made for nanos.
Interesting note, since the addition of rotifers, I have had brown skimmate. Also, I am keeping a separate .5 liter culture of them outside of tank fed with tank water, and the culture is doing great, so that gives me hope. Water goes clear every 24 hours and I dump 1/2 of the culture into the tank to be replaced with fresh tank water.
I also just hatched a bunch of brine shrimp in my 1 gallon phytoplankton culture, so I am going to let those grow out then either feed them to my clown, or try to use them to clean the water.