Point may be proven, but it was proven from the start, it was never argued. The secondary point I discussed was ignored. And that was that feeder guppies are inexpensive alternatives to ammonia additives if you have hundreds of them on hand.
Answer me this, what is the difference if a fish eats a guppy and poops it into ammonia than if bacteria decomposes a guppy and turns it into ammonia?
Is it the suffering of the guppy as it burns in ammonia?
If so, would it then be OK to kill the guppy and then use it's dead body for ammonia? That is the same exact thing as using fish food because well, they are fish food
You do have other options to control your population rather than allowing them to suffer. Give them away to fellow hobbyists on this forum, for instance. Or, as you said, use them as feeders to continue the cycle of life. Or stop allowing them to breed to uncontrollable levels.
I DONATE to my LFS 200-300 guppies a month. I still have 200 left in the tank after that, I can't bear to just kill all of them, so I cull out the ones that are lower grades for food and assorted uses.
I don't think anyone on this forum would care to pay $7 shipping for a bunch of colorless feeder guppies they can get 15 for $1.
Please give me other options, because I really do need to do that.
It's nearly impossible to stop guppies from breeding. I could leave only 2 in the tank and a month later I would have 100. The following month would be 500. I could either kill them as fry or cull them after they develop as adults, either way, I can't necessarily neuter my guppies can I? Help me out here.
As for OP's sand, I would like to know what it is also. It looks beautiful and I would love to use it in a nano.