Thank you very much for all of the suggestions. I guess two heaters in beneficial in case something happens to one of them there is still some heat coming into the tank, allowing for valuable time to discover and address the problem.Hello; I run an HOB on a 55 gallon that does fine.
I also have two UGF's running with air from an air pump which might not work with sand. UGF's are not current tech but I have run them for several decades. The point being I like some sort of air bubbler in a tank.
Hello; Sand has some issues. One is fine sand can compact and form toxic gas pockets. The cure is to have the sand at no more than an inch or stir it up every few days.
Another issue can be that sand can get into a filter and wear out the impeller quickly. Giving the sand a very good rinse will help some. I no longer use sand but many still do.
hello; may I suggest getting two smaller heaters and not just one. If you need 200 watts then get two 100 watt heaters. There are good reasons for this.
Good luck