Test kit, yes that a good idea, but if the tank has been set up for 8 weeks I would say he has successfully cycled it with fish. If it wasn't cycled they would be dead by now
Various blooms of algae, bacteria and diatoms are pretty common in a newly setup tanks. Usually you can just keep up the water changes and ride them out and the tank clears up again.
I'm not familiar with the filters you are using and wether they need upgrading, but they should be handling the load fine while your fish a small.
A UV filter may be the best way to clear up the water quickly?
Cheers
Ian