DOHO Aquarium Divider Grid Isolate Board Fish Tank Bottom Black Filter Tray Aquarium Crate (11.8 x 5.9inch,Black) 6 Pcs

Yes its sturdy, has good suction and stays in place, but holes are too big for small fish. I added netting on one side. Actually the fish I tried to separate were about 2 1/2 - 3 inches long and they were able to swim through to the other side by the suction cups. And thats less space than the holes themselves. Maybe the makers can come up with a smaller hole - tighter fitting divider

Works perfect easy to cut to size sturdy to keep black Piranha away from my cichlids and water pump allows water to move through it, and it keeps small fish from also going through holes, 120 gallon tank 18 x 20 worked out perfect

it fit my 60 gallon fish tank just had to cut about 4 inches off one board it's great sturdy and strong made very well great product....

I’ve ordered them for the first time and just love the ease of assembly and meets the purpose. I’ll order another pack of them and use as top of the aquarium as I don’t have one.

this product is very sturdy and would work well with medium sized cichlids

I was able to section my 75gallon tank with no problem. I was also able to cut it.

Looks like it would work fine but the holes are way too big to keep in anything smaller than a large Cory cat fish. I waited forever to get this item because my guppies are attacking the other fish but now I’ll have to wait even longer before I get something that works.

Our Top Fin Pleco was ramming anyone that might steal his food and territory. (big jerk) We got this to separate the 46 bow front tank so nobody else got torpedoed. It went together easily, stayed together securely, and the suction cups are holding very well, no slipping or lost suction. Cuts to size very easily, we used wire snips. Would recommend.