I normally keep 50w heaters in my 10 gallons, but somehow this slipped my mind yesterday and I ended up buying a submersible 25w top fin. It's only rated for a 5 gallon. This is an adjustable heater up to 93* and I do have thermometers in all of my tanks.
Basically my questions are -
are top fin heaters okay? I know theres alot of complaints about certain heaters, dont know if this is one of them.
will a 25w be too little for my 10 gallon since its rated for only 5.
and if I do end up having to turn it up too high will it cause any problems such as heater breaking faster or anything?