The rule of thumb for choosing the right heater wattage is five times the size of the tank so in your case would be a 100 watt.
There should not be a problem with using it in your tank except if its a cheap heater and prone to fail then it just might fail in ON position in which case can cook your fish if its not caught in time.
I use the 200w hydor on a ADA Mini M its about 5g. I haven't had any problems yet. I did have a Hydor inline fail on me and heat my 60g to over 90 though. Hydor replaced it for me and gave me a free extra one so I sure this doesn't happen very often. I haven't heard of any other people having problems with them so I wouldn't worry about it. I would buy another one again since I hate having heaters in my tanks.
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