There should be no problems, I have kept the combo before. The only major no nos with plecos is multiple males, with too few hiding spots. Diet for these is pretty diverse, both meats and veggies should be offered regularly.
You should be checking your water params all the time... pH, nitrites, nitrates, ammonia etc. Obviously the 3 aforementioned should be low, and pH is good around 6.5-7, but plecos can be kept happily in more alkaline conditions too.