hey louis i have finally got my 125 started up and am going to need a heater since it is positioned near big sliding door . it also has about a 55 gallon sump. what size heater would i need and how much will it run. i don't want a cheapo but i do want one that is digital that i've seen. let me know. and also i still want a couple convict tangs just go to wait to make sure tank is stable.