I'd be careful with 2 tigs and 2 juruense in a 180, thats a pretty big tank but with 4 shovelnose specie like that they will a) easily out grow it b) tigs/juruense have been known to be territorial towards their same species sometimes and they are the exact same body structure and have similar needs. If it was me, I'd stick with 1 of each and maybe get a different pimeloid instead of another tig or juruense. I've had great luck with my tig, planiceps, lima, and tsn all in my 240 and just recently am moving some of them out because of space but never had any aggression amongst them and have kept them from 2" up to the biggest being the TSN at almost 20" now