Thanks for the advice peeps. One thing i'm wary of is how my blue acara may react to higher temp there preferred is 23 deg c i have mine at 26 already. My lfs is over an hour away can i use any other kind of salt i could pick up locally? If not does anyone know a good uk aquarium mail order supplier? Even with lights off It is a pretty bright room. could always cover tank with blanket like when i had serious algae problem. One thingi would say is they all ate very well this morning. Hopefully only in early stages of infestation.