Lawnmower/algae blenny compatibility

[Paxthemax]

Are 2 of these blennies ok in the same tank? 75gal with 60ish lbs of live rock.

Is there any way to sex these fish? The larger has red/pink a cross the top of its fins.

My wife got one approximately 5-6 weeks ago. 3 days later it was no where to be found. We assumed since it was so small it died and the crabs did what crabs do. Yesterday we were at the LFS and got another one. Well I was doing some more in depth maintenance this morning I found #1 under/behind the sponge in the overflow alive. We managed to flush it down the pipe to the sump and caught it and put it in the DT with the other.

 

[DeniseAndy]

Not too many put two in one tank. I have only one in my 210g. Maybe someone else will chime in. I am not sure if it is aggression or food issue with these guys. I am guessing that two could be a problem in that size tank.

 

[eatbreakfast]

They usually don't tolerate conspecifics. It may be ok for a little while. But in most cases, as they mature, their hatred for one another increases.

 

[Gunzen]

They usually don't tolerate conspecifics. It may be ok for a little while. But in most cases, as they mature, their hatred for one another increases.

Like Giants and Dodgers fans...