Hi, I just completed a cycle on my first tank, so my expierience is limited to say the least but, 1. you definately want water moveing all over the tank, it will help keep that nasty brown algae from settling as much [if you don't have it yet. it's coming,lol, sorry] 2. I used dams as well and killed 6 of them [i will never do a live fish cycle again] but now the 2 dams and 1 chromis are doing well - but I have yet to see them "resting" on a suction line or anything like that, keep close track of you water parameters, high salt will make them "labor" high nitrite and nitrate will make them sluggish - -high levels of any of this will kill them.
On another note my 2 yellow tail dams are mean lil bast#%ds, and keep the chromis corraled a lot of the time, so i thought he was hanging by the heater too, but after my last tank clean, i moved the heater and he didn't go with it................read read read read read....good luck looking forward to pics down the road.
any advice from Saltwater pimp is solid