Does pleco need oxygen/oxygen pump? I heard that it's originally from river so yeah. And I have a common pleco. Thank you 
What?Depends, is it dead or alive? Doesn't really matter with that 15g tank with a FH, it would be dead soon.
Ahhh I separated my pleco into another tank. My FH seems happier now. Will buy a new tank soon. Btw, the FH is still a baby around 7 cm15g is too small for a FH or pleco, let alone both of them. Expect your FH to tear up the pleco into bits. A dead pleco doesn't need oxygen. Please give/sell your FH and pleco away if you are not intending to upgrade anytime soon and house more appropriate fishes like neon tetras or danios in your 15g.
Ahhh I separated my pleco into another tank. My FH seems happier now. Will buy a new tank soon. Btw, the FH is still a baby around 7 cm![]()
I'm not sure what size i think it's 7 gallon. Sorry I meant OXYGEN PUMP :/into what size tank?
are you even serious about fish keeping? what kind of question is does X need oxygen?