Don't know whether the UV will kill off the copepods before it get into your phyto culture......if it does not kill them, you will not be culturing anything but cyano......and your rotifers will die from starvation.
For your info.....you need more than 1 phyto culture to sustain 1 rotifer culture. Rotifers main purpose is only to eat and reproduce.
Another thing you did not mention is the fertiliser for the phyto....if it is not use up......imagine the amount of nutrient you going to put into your tank ........you will see that your tank will turn a lovely shade of red and it is not coralline