Losing Fish

[jo1010]

Have lost two angel fish in last 24 hours now this fish is larthegic and has this white lump any advice.

Newish tank had water tested in pet shop and all was clear

 

[Ch4rlie]

Going to need a lot more details than that and pics if possible.
 
Tank size?
cycled tank?
Ammonia, Nitrite, Nitrate and Ph readings if you have them, also what test kit do you have if you have one?
How long have you had fish and tank?
Added anything new to tank lately? fish, decor, gravel.......
You usual water change, how often and how much?
 
Start answering with those then we may be able to advise a bit more.....