No loricariids are monogamous. Also, as far as anyone is concerned, L-200s have only been bred a small number of times; mostly via German breeders, and L-128 has been similar spawned in Europe. The baryacnsitrus version, to date, has not been bred with any documented evidence. The waters they live in, however, are white or clear water rapids, with neutral pH and medium to low hardness. The substrate is generally silt, and they tend to dwell between and amongst rockwork. That's probably your base one for breeding, though, as has been shown over and over, loricarids breed just fine in unnatural environments.
I'd suggest you to sstart off with something a little less demanding, spawning wise; maybe an ancistrus, and work your way up...