hey is that cheap tank heater at wal-mart any good? Like it is the right size that i need and i have read a lot of mixed reviews on it, Sooooo i am not sure if it is worth buying or not. I am currently using desk lamps to heat my water and it keeps the water at 78, but i'd rather have proper tank heaters haha but all the ones i have seen at petco and petsmart are way to big for what i need