It's not very kind to the fish to borrow it.. the multiple transitions and car rides can be very stressful to the fish.. I wouldn't suggest it.
It does sound like MTS and I wouldn't suggest getting rid of all of them.. they are very beneficial to the substrate and the MTS I have are wonderful enough to clean up fish doo doo and any uneaten food, as well as any decaying plant matter.
I think they're hideous too though. I got one assassin snail in hopes of curbing the population a bit. If you get multiple assassin snails then they are likely to breed and you'll soon end up with no MTS but plenty of assassin snails which, I do not believe, will eat veggie matter so you'll have to feed them somehow. Although, I only bought one but now 2.5 months later she laid a bunch of eggs so I'm waiting to see if I'll end up having more assassins than I originally bargained for. I've heard they do have a low survival rate, so here's hoping I don't have a new population to deal with!
I don't try to remove a the MTS because of their beneficial uses, but I always make sure not to overfeed my fish and if the MTS population gets too high I'll just manually scoop them out into a little zip lock bag with some water in it, freeze them, and then dispose of them. I hope that kills them....
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