I live in SW FL. During the summer the house temp is kept around 75 degrees (73 at night to keep the wife happy). We have central Air Conditioning that keeps the temp consistent during the summer. I was going to do SA Cichlids but again the wife wants African Cichlids which I used to breed during 1980's through 1990's. Anyway in the winter months it may go down to high 60's mid 70's outside so we turn the ac off. Occasionally (maybe a month out of the year) the nighttime temp may dip to high 40's. So I was thinking one 300 watt heater would do it. There are so many new gizmos available now compared to when I did this 30 years ago. Could really use some help on heater brand suggestions as back then my fish room had central heating so I did not use heaters. Also wondering what temp everyone is keeping their African Cichlids at.