I would throw some Cheerios in there now.
The will float high and resist water logging for a fair bit of time.
Tiny BG should be seen flashing at them trying to eat the food. GSF or larger BG will be able to eat a whole Cheerio. If something is eating them whole, put a Cheerio on a small hook and see if you can catch one for examination. I think a cane pole (or even a stick) is easier than casting to catch fish 6' away.
6' Ultralight spinning rod, 2# test line and a large spool spinning reel, I can cast a 1/100th oz leadheag jig with a 1" twister tail 30+ feet. I can also toss a #10 Owner Mosquito hook with a single Stubby Steves pellet about 30'-40' with no additional weight or a bobber.
If I want really get a lightweight lure out there using spinning tackle and not a fly rod I can put a bobber on it, attach a split shot directly under the bobber so it barely floats and that added weight allows me to cast 60+ feet while not affecting how the lure/bait looks in the water.