When should we use hero in 25 man? We are having trouble in the first minute of the fight.
What are you having trouble with? We used bloodlust when he was under 30%, in execute range, after a turtle kick (he gets a debuff of some sort for a short while then).
Focus on nuking down one turtle at the beginning, have someone be ready to kick it at the breath, finish off the other two turtles, one of which you can chuck at bats (always keep one spare just in case), aoe bats, go boss, turtles are back, kill them, aoe bats, rinse and repeat. It's really straight-forward. Use some cooldowns for the quakes and for the bat tank during quake stomp.
Killed it in 25s last night, didn't even bother killing the bats. Stuck blood DK on Tortos, and BrM monk just used Dizzying Haze to pick up and kite all the bats around the room the whole fight. DPS just focused down the turtles and boss. Got a tad dodgey picking up some of the bat-packs, but we killed it. Vid link below with sweet Super Mario Bros music. Its from dps warr perspective, but you can occasionally see me rolling through with like 80bajillion bats in tow.