“This is so great so you don't take away moving area for my other fish. The babies were in a small kids 29 litre tank and the typical suction cap on breeder boxes was just too much in the way for my 2 Mollies to swim around comfortably. Easy to set up. The o ring was broken but didn't matter cause I just electrical taped in the pipe. Only thing I wish was the water going into the breeder box came in a bit smoother as it glug glugs in. But that seems to be the opinion across the board once I did some youtube-ing”