Thanks for the advice.
A few of the light level monitoring type project I've seen (like this one Tutorial – Use a Light Dependent Resistor (LDR) to Measure Light Levels | Hobbybotics ) don't use op-amps at all. Am I right in assuming they're used to bring the range of output from the photodiode up to the range of inputs for the analogue pins?
If I tried first just directly connecting each anode to separate analogue pins, powering each anode separately from 5v with a resistor in series and the common cathode direct to ground, would I be in danger of damaging anything?
If I can get working readings like this it would only take 4 parts (without target illuminator), making the whole project much simpler.
I've ordered a few and some SMD adapters so I can try it out, hopefully results to follow within a week.