Well, finally my account is pleasing me, Just got my dark ripper evolved to 5*, I have a full set of rippers, the other 4 colors working their way to level 70, but I have the keepers I need and evo mats so its just a matter of grinding. My first MSK is 62 and close to evolving to the ADK Been spending all my time more or less on marine goblins. I started running the adept sky dragon blue as their is a better chance on average of goblins than sea cave mercury, but if you need a siren still run sea cave. My StE has gained 18 levels being fed marine goblins - there is no advantage to feeding 1 or 5 at a time right? Only gained a couple skill ups so far.
I had 7 stamina so I ran sea cave and got a second mermaid - is having 2 seen as very useful or is that mostly for healer teams?