Hello i have a 150 gallon tank that i have filled with approx. 90 gallons of water.
I keep 5 mud skippers and 6 anableps currently. I am planning on adding 2 South American Dragon gobies.

I realized that i do not have anything that is going to stay in the middle area of the tank. The mud skippers spend most their time out of the water on the rock work, artifical drift wood and floating lilly pads. The anableps stay that the surface and the Dragon gobies will stay at the bottom.

I am doing a "Monster" Theme'd tank (if all the oddball looking fish did not give that way) Do you have any suggestions?

My salinity stays about 1.005-1.008 and ph is kept at 7.5.

I have considered scats but they eat live plants, which i have lots of.
And monos aren't very monster looking.

I also wanted to know if a flounder would fit in? they are pretty wicked looking.

Any suggestions you may have will help.
Thanks.

Drawing blanks?