Are Mono's fin nippers?

  • We are currently upgrading MFK. thanks! -neo
Well in my tank, the Mono Sebae doesnt really look at the Columbian Shark catfish at all. As some of you may already know, I was having issues before with the Figure 8 Puffers beating up on the Columbian Shark Catfishes.

I was thinking about getting a GSP but I dont want a rerun on the same crap again with another puffer beating up on my other brackish fish.

I currently have my SG at 1.014. I am still debating whether to go up and further in my SG levels or wait till my fish get bigger. (Archer 4 inches, Mon Sebae, 5 inches, Columbian Shark Catfish 3 inches, pair of Molly's.....

At those sizes is it safe to raise the SG further?

Any other species I can keep in there that tolerate higher end Brackish eventually Full Marine?
 
I had 8 mono argentus in 125 gallon tank and they’re nipping each other to death. Is that normal? I have only 6 remaining now.
 
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