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bioload considers waste, oxygen, ability to process waste, fish compatibility, space requirements for fish.....
obviously the addition of plants eliminates available room to move, potentially increases oxygen (water can only hold so much depending upon altitude and temperature), changes the bio filter dynamic....they do not change the amount of space a fish requires. 6 sq ft of floor space in a tank is 6 sq ft of floor space. Plants do not change species specific issues relating to space. they can change the compatibility dynamic.
you need to factor the plants into the decor side of the stocking equation and then determine what you can do with number and type of fish. plants do not by default increase of decrease number of fish you keep. you still need to factor in space, gallons, species...."I usually read the obituaries first. There is always the happy chance that one of them will make my day." -- Richard Ames
Many people believe that plants increase the number of fish you can keep b/c of the plants ability to absorb waste/nutrients. My experience is that over stocking leads to increased algae issues.Member of Delaware Valley Aquatic Gardener's Association (www.dvaga.com)