Personally, I say leave the situation as is, if you feel the need to augment your heliamphor'a growth, do so with a very dilute fertilizer solution. If memory serves (I haven't been to actively keeping my cp knowledge up this last year) heliamphora may be more of a detravour, providing a ideal environment for decay to happen within their pitchers, and possibly mildly helping the situation along, rather than being a carnivore. I tend to think of it as an opportunistic plant, not a carnivore. Another thing to consider, is whether it will handle the insects your sundew catches well? kind of like a VFT getting a nice acidic ant than burns the trap.
I also find the ethics of concern over a plant, or its insect pray interesting, or as someone mentioned, drawing the line at animals with a central nervous system. Where do you draw your ethical line how relative is it?
Example, going off the Vegan not touching an animal with a central nervous system because it can feel pain:
Lets say we have a perfectly nice cow, is never going to be slaughtered or used in a dairy farm, the outside life expectancy for it is around 20 years, throw it in a dairy farm, 4 to 6 years, make it a market animal for beef, 1.5 years. It has a central nervous system, highly developed digestive tract, feels pain, recognizes and cares for it's young, (recognizes it's owner as well (we have some cattle on our ranch) and is generally, while not considered the most intelligent creature in the world, highly developed and complex. However, it is a 100% domesticated animal, it's been bread for thousands of years for purpose specific existence. Let's compare it to two other creatures:
Creature 2, the sea anemone. The sea anemone is not by any means highly developed, it is a corallamorphin, belonging to the cnidarian family (coral also belongs to this family) and does not feel pain, it's stimulous is (in most cases) to react to lighting, and chemical reception, i.e. if it's blastocysts touch food, they strike, and the anemone eats. It has no central nervous system, is made up mostly of water. It's definately not a food animal, but thousands are harvested off reefs every year to supply the aquarium trade. fewer than 5% most likely survive the process of being trans shipped held in various tanks, and eventually being plopped in a tank, fewer than 5% of those probably survive do to lack of knowlege on the aquarists part. What's the big deal? it's a blob of jelly right? right... an immortal one. Sea Anemone's do not age like we do, they simply have no cellular degredation do to their age, there are anemones in the wild believed to be hundreds, if not thousands of years old, size is of no value in determining age, anemones shrink and grow according to the food supply. Is it ok to take an anmial out of the ocean and possibly POSSIBLY end it's existence for the sake of your pleasure in owning it? CP collectors generally don't suffer this moral compunction because most of the plants are captive bred, this is not an option for many reefkeepers. Anemones are certainly not endangered. I have an E. Quadricolor anemone in my reef tank, it's a hardy species that usually survives in aquaria, I also have about 80 aptasia and mojano anemones that are so well adapted that they can become a plauge, much like weeds in the garden I kill them with aplomb, where do I draw my ethical line?
How about another food animal... Octopus and Squid, arguably some of the, if not THE most intelligent animals in the ocean, next to man there is no more highly developed nervous system on the planet. Like dolphins they display rudimentary intelligence, curiousity, pleasure at recognition of their owners (if kept in an aquaria). They typically have only a 1 or 2 year lifespan however. And we eat them as food. Yummy Calamari.
Hows that for an ethical dilema?