Of course you can! I have a 125 which is similiar footprint to your tank. I have 18 polys with angels and loaches. Filtration is two canisters and two Emperor400. 50% weekly water changes.
Be prepare to spend the money on polys. Like Beblondie said once you move pass senegals the price jump from $10 to $25-$3000 a for a poly depending on specy.
I had 5 Sens and 2 Ropes in a 55 with other inhabitants with the largest Sen around 7". I recently upgraded them to a 125 and added 2 more ropes and a Retro. I then moved the 2 largest Sens into the 185 with the bigger ones. It is pretty cool to watch a 5" Sen go shooting across a 6' tank then loop down and shoot back to the other side.
My two Sens and the Delhz are about 9 inches. And the BGK is 9'' too. They are in a 55G right now but in a week or two will be upgraded to the 125 if I can find a used one...lol.