Dwarf Gourami building bubble nest

My dwarf gourami mail started bubble nesting in the corner of my community tank. This evening i noticed spawning behaviour in my Gourami couple. It will be a near impossible task to remove them from the tank now. Does anybody have any suggestions? For future breeding, when must i move them out? When he starts nesting?
It is very hard to catch that bugger in my tank as i have LOTS of hiding places, plants and wood.
The other fisk in my tank are:

• Oto's x 3
• Zebra loach x 2
• Kuhli loach x 2
• Pristella's x 6
• Red Danio's x 2
• German Blue Rams x 2
• Guppie's x 2

My tank is a 186 liters corner tank that is very well planted.

 

Well I'm probably of no help, but you maybe try and separate the tank with egg crate covered with one of those net like materials that you get at a fabric shop.