And...? Does it work good? Does the temperature fluctuate? Is it lower than what you set it to?
Just saying "I am using a visa-therm stealth 75 watt heater for my 20g" doesn't help much.
Not trying to be snobby or anything, just thought that was funny.
Visitherm Stealth's are excellent choices for slatwater from everything I've read. The rule of thumb with heaters is just dont buy the absoloute cheapest model