For some time, I have been thinking of switching my dither fish around. My SAEs pick on the Brilliant rasboras because of the size differential (6 inches vs 1.2 inches). Since most of the SAEs stay in the 300 gallon tank I wanted to move the Brilliant rasboras to the 75 gallon tank and the giant danios from the 75 to the 300. Catching fish out of the 75 is no problem, but catching them out of the 300 gallon is difficult especially since I have 15 pieces of wood in the tank and I didn't really want to remove it all. So I had been putting this off until one of my giant danios went through the water bridge to the 300 gallon tank (she must have accidentally done it and clearly did not know how to get back). She was all alone there and did not seem too happy. After some days and some thought, I added the following net with wooden dowel rods on the edges.
Then I used a small net to corral the dither fish above the big net and then lifted up the sides of the big net. They were then easy to catch.
The lone giant danio was positively giddy for at least 20 minutes after her companions joined her.
This method works well for dither fish, but would not work at all for loaches since they disappear under all of the wood.