Thank you Jen for your reply.I really appreciate it
I was worried and salted the tank.It's salted at 0.2% now...The meds that I have are
Parazan D
oxophosphoric acid 50 mg/1 ml
Tropical N
Trichlorfon 1 g/10 g
Acrynol 0.2 g/10 g
Sodium chloride 8.8 g/10 g
Refish
Trichlorfon 1.5 g/10 g
Hydrochloric acid chlorhexidine 0.12 g/10 g
Sodium chloride 8.33 g/10 g
Green F gold liquid
oxophosphoric acid 500 mg/100 ml
Green F
Methylene blue 0.1 g
nitrofurazone 0.6 g
I haven't seen the pleco sucking on them but I guess I can't tell what's happening after lights out

These 2 were always active and it's the first time I saw them sitting at the bottom.They have always come up to me when I go near their tank so I am worried.I don't wanna lose them...which med do you think will work best?