I recently bought 3 Odessa Barbs for my 20 gallon. There is only a Raphael Catfish and a Upside Down Catfish in there, is they have settled nicely. Even though these are all females I believe I love the colors. They are also very active and seem happy in the tank. But I read that barbs prefer cooler water, around 78 F. So should I just pull the heater to make them more comfortable? I feed them frozen blood worms and they eat great, but would this make them happier?