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i'd do the achilles and pair it with a power blue and add them both at the same time - last to the tank.
neon gobies are awful small in a 120. Don't get me wrong - I loved the little guy when I had it - it was servicing my firefish almost like a remora on a shark. Plus they are tank raised. But...
I had 3 hitch in on the LR I bought from a fellow njrc reefer.
First one was small on a portable piece of LR. Took it out and dropped a squirt of lemon juice. Watched it turn white and die.
Second one was larger and someone had migrated onto the one big piece of LR I cannot move. I ignored it...
A larger triggerfish or lionfish comes to mine - but I've never owned a grouper but I thought they will eat anything. Scientists had even suggested the grouper in the atlantic could be a potential predator for the invasive lionfish.
For future reference - a damsel or other fish is not needed to cycle a tank. Cycling involves building the bacteria needed to help break down harmful ammonia/nitrite. Rather than subject a fish to this treatment (and also the pain of trying to pull a territorial fish, it's easier to just use a...
Welcome! thank you for serving and helping others. Another 120 owner - and an extra tall at that! Does that make it slimmer front to back or just shorter from side to side? You have to start a tale of the tank. There are quite a few 120 threads that hopefully can give you insight on the pluses...