The cheapest solution for feeding zoanthids is to not feed zoanthids, they definitely don't need it
Actually, the statement above would be the best to answer the question!!!!
Yes, zoas don't need to be fed. You're right. About 98% of it's energy probably comes from the zooxanthellae.
I found polyp stimulation and a bit of speed on their growth, when I feed the right food.
Excess will have the opposite effect because of the water quality. Specially when adding too much of liquid invert food in the system.
We need to be careful when feeding zoas/corals, but they actually like a target treat once an a while.
Difference between target food and fish poop?
Target food will feed them a good quantity of nutritious particles at once.
Fish poop will feed only a small number of polyps and most of it is by absorption. I never saw a zoa feeding on fish poop yet. The poop stays on them for a while and they don't grab.
If you feed them for example Coral Frenzy, they will actually close, grabbing the particles and swallowing them after a while.
Fish poop has low nutritional value, compared to a quality/balanced/target food, I believe.
It's an option too. All good.:thumbsup:
But yeah, you're right, we don't really need to feed zoas to have them with good health and happy for a very long time...
Another truth: zoa growth and reproduction don't depend only on feeding (lights or target feeding).
:beer:
Grandis.