Re: Is there any big fish that is gentle to adult Yamato or cherry shrimps?
Instead of guessing, why not get a bag of those feeder ghost shrimps (Palaemonetes spp) to try out? What may work in one's tank may not work in another's because of individual fish's character and the balance of power (who's in power in that tank).
eg: I kept a 2.5ft pacu that was traumatised at childhood, together with discus, a pleco, an Ancistrus, some otos and I gave ghost shrimps as a treat to feed the pacu, hoping he'd get a better balance of diet.
But instead of eating the shrimps (or oto for that matter). the Pacu chose to eat nuts (pistachio, almonds, cashews, brazilnut,) instead of the shrimps.
However, when the pacu is gone, the discus started to hit up the shrimps, despite the amount of food it is fed, they still will attach the shrimps... and the plecos decided that they love discus slime and hit on the discus in return....
So it is not possible to safely say which is the biggest fish that will live peacefully with shrimps, but to test it our for yourself in your tank. However, if you are thinking of introducing fish to control planaria, it is wishful thinking from my past experiences.
Fish almost never want to touch the worms unless they are starved. However, planaria happen mostly because there is excess food in a shrimp tank. This alone tells you how futile the effort will turn out to be.
I eradicated my planaria with:
1) added ghost shrimps to help remove uneaten food,
2) more frequent gravel vacuuming since I can't stop myself feeding me pets,
3) more frequent rinsing of the filter media (there's lots of em planaria in there as food gets sucked in the filter).
and if all else fails (the above steps had been sufficient to work for me mostly), I once added "Vermex" at half strength to the tank with the above 3 steps for a particularly resistant case and the most stubborn planaria died out within a week with no loss to livestock.
Warm regards,
Lawrence Lee
brothers, whatever is true, whatever is noble, whatever is right, whatever is pure, whatever is lovely, whatever is admirable--if anything is excellent or praiseworthy--think about such things.
Philippians 4:8
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