I purchased the zebra loaches because they are very cool, compatible with the other fish, tolerant of the high temp, and because I saw a few pond snails that were eating my plants. The zebras took care of the pond snails (not really rapidly), but upon examining my tank at night, I found about 100 MTS - mostly very tiny.
I actually like the MTS - a neat new part of my tank ecosystem. Further, my tank has never been so free of algae as it has since they colonized it and they don't eat plants. However, I have read that they can become superabundant and reduce water quality. Thus, I would like to control, not eradicate, the MTS.
I lean toward loaches as a control method. I prefer not to use chems. The baiting method is valid, but more work. If I analyze it further, this is probably just my an excuse to add a new loach species to my tank
. My zebras do not seem to be having any effect on the MTS population. I believe zebra loaches are more diurnal than most hobbiests realize. Everytime I look in the tank at night with a flashlight, the zebras are tucked into the tiniest crannies of the driftwood that they can fit in (very cool!).
Interstingly, the discus forums tend to advocate loaches as a control method more than than recommended here. Clown loaches are the most frequently recommended species, but I have read they can be tough on plants. I also would prefer a smaller species. B. almorhae and Yasuhikotakia sidthimunki are recommended, but I am not sure if they will turn out diurnal like the B. striata.
Any advice on the best loach for MTS control would be appreciated
Many thanks!
On a positive note, they swim around with MTS hanging out of their mouth like little party horn blowers! 
