You often see ‘fertilize weakly, weekly’. This is way too much fertilizer for house plants.
Fertilize your house plants when you repot them.
Fertilize your house plants once in the spring.
Fertilize them once if they are recuperating from a problem.
If the house plants are potted in dirt a bit of worm castings mixed in the soil is about the best fertilizer you can give a plant.
Most of the soil you buy for your plants already contains enough fertilizer to keep them going until the next repotting.
Useful things: ( sources for worm castings )Gardens Alive!