I had the same problem...I replaced the MJ400 for a MJ1200 and that helped out a lot on the first reactor, but the second one was still kinda bunk. I ended up running each of my TLF's seperate, each with a MJ1200 driving them, and I haven't had any issues since. I think there is too much flow restriction when they are running together...then again, this is just one noobs findings. HTH
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