ok this week has not been good at all I have a 45gallon freshwater planted coumity tank first my filter went up so I went and spent $60 on a new filter and then my heater decides to explode in my tank so I order another on and shipping says is will be here tomorrow and then my light on my tank burned out now I can see on my last few fish(most have died already) white spots on the ends of the fins what could that be frost bite idk if fish can get it but they are warm water fish and the tank is cold about 55degrees once I get my heater and the tank gets back to the right temp would the living fish live and would those marks go away or what should I treat the tank with