in my opinion, a 35 gallon tank is too small for Labidochromis caeruleus. as with other Mbuna, alot of rockwork is required to establish a proper environment for these species and by the time you've added enough rock, there'll be insufficient room for a proper group (1 male + 4 females).
ramirez requires (does best) in soft, low TDS water with a slightly acid to neutral pH. ALL African cichlids require hard, alkaline water. thus, rams and yellow labs are incompatible.