the top 3 common beginner dendro's seem to be azureus, leucs, auratus. From what i've researched, azureus do good in pairs, leucs can handle being in groups, and auratus are better in pairs (i believe not positive on the auratus). Leucs seem to be said as the boldest of these three. I myself have 2 4 month oldish leucs. They are very bold, after warming up to their home they are out all the time and rarely even move if i open the door anymore. They are active hunters and always climbing every inch of the viv looking and hunting down food. Very cool to watch imo. Leucs are known to climb vertically more than the other two also. Auratus are said to be the most shy of the three but there are ways to combat this.

Don't be worried about culturing FF's. If you do get into darts then i'd suggest buying a premade media from a good source to start out with, and get a couple cultures to start culturing with as well. I use Josh's Frogs media and it seems to work excellent. I get huge fly booms off it. Just keep cultures in different stages and make at least 1 every week (number of cultures to make usually about 1 per tank you are feeding per week should work good). I only have two frogs to feed but i have 2 cultures that i bought from Josh's, 2 that i made a couple days after recieving them, 1 that i started a week later, and 1 overflow culture that i feed out the overpopulated cultures into. I only feed from the overflow cup, i don't start new cultures from it. I use melo flies which are more forgiving and faster producing over hydei