we got the tank given to us and it only had 1 pleco in at the time this was like 5days ago i cleaned the full tank then put the pleco back in then 2days later we got some baby molly's then the day after we went to the fish shop and got the betta 3 molly's and some other fish let me find what it is
the dead fish i have just been messing near its eyes and the eye ball seems twisted inside
the other new fish looks like a tetra white with a blue kind of belly
Plecs have also been known to suck fish eyes out.
Get your water tested as soon as possible.
Invest in some liquid test kits.
Do some research on the fish you keep.
Find out the name of the plec.
How many gallons is the tank?