Anything from 5000K to 8000K will be appreciated by plant's or combination's thereof.
I would go with two heater's also but would myself,, go with 200W to 300W and in this way ,,neither will have to work as hard to keep water at temp selected.
I would recommend two eheim 2217 filter's but one would prolly suffice .
I ran one eheim2217 on 80 gallon and it worked well until plantmass became large enough that flow throughout the plant's began to decrease and plant's began to struggle as well/
I believe the increased flow, helped deliver nutrient's better to all area's, and plant's began to improve shortly with no other adjustment's made to the tank.
Not many tetra's enjoy the warm temp's that the
Blue Ram's? thrive in with exception of
Cardinal Tetra's and perhap's rummy nose.
most of the other species of these fish seem to do better ,longer,,at temp's around 73 to 76 degree's as well as many of the corydora's.
Hope some of this help's.