mag 24 is nolonger in the setup due to possible bubble concerns. but it wasn't the pump. so i traded it for a little giant 4mdsc. was using 2 mag 24 on a 125 and as soon and the salt creep kicks in the seal up real nice, lol. as for using 45 if found that with this much flow it turns the sandbed up too much so the korlia's do a good job moving the lower water column. before i set up the tank with salt, sand and rock i filled with rodi water and added yellow dye to watch for andy possbile dead spots using broken concrete blocks as fake rock and the 4 90 and 2 power heads seem to do the job. had 6 outlet originally and was not getting the water movement i wanted at the other end of the tank. thanks for the nice comments and suggestions. will post some more pics soon. i want you guys to compare 20k hqi to the new bulb i bought the said it was a 20k will start a new thread tommorow