I agree with welsher about thinking twice on adding an eel to a reef, they can be destructive and are messy eaters which will add to the bioload. You can manage the bioload whether it be with skimming, dosing, algae scrubber or reactor and water chages. A 65 is an adequate tank for a snowflake, but they can be one of the most active eels. Their activity will be rough on corals.
Dwarf lions are good choices for a reef, I personally feed my lions live food. You could have a fu and a fuzzy in a 65, as long as you understand their feeding requirements you'll be fine. Weaning to dead food isn't 100% guaranteed. As far as flow goes, my lions are in a reef and they are happy. They do like caves and perches to hang. I have 5 tanks and my lion reef is my favorite.