Plec breathe air like you and me same as corydoras air breather, they do not breathe through water like normal fish do, so if you keep cory's or even plec's then please for thier sake leave space for them to breathe. Do not under any circumstances fill the tank rite up to the sliding cover of the glass, leave at least an inch of air space. So it may not look nice, well if you dont like it then dont keep them. and as for ballast control you heard that somewhere, i find that insulting, read before you get a plec, if you did then you would know! sorry if i insult anyone it is not my intention to do so.( but ignorant fish keepers get up my tree! ( that is my opinion and my opinion only))
i have kept plec's for almost 10 years. cory's even longer. so i do know a thing or two about their habit's, etc
once again i apologise if my words are strong, those in the forum know i do not blow off stream often.......
Juanveldez i will glady look around and find you a name and an L number for your plec.