Let me start by saying, these OIIKI feeding rings are a lifesaver for my community tank! My neon tetras are such slow eaters, and the greedy goldfish would hog all the food. With these rings, I can finally target-feed different fish groups simultaneously.

The square and round design gives nice variety - I use the square one for floating flakes and the round one for freeze-dried bloodworms. The black color blends surprisingly well with my planted tank background.

Here's what surprised me: The suction cups hold remarkably well (when they're not defective - more on that later). Even when my excited fish bump into the rings during feeding time, they stay put. The foam material keeps the rings buoyant without looking obtrusive.

MAJOR PRO: My tank stays so much cleaner now! No more food particles getting stuck in plants or filters. The rings contain about 90% of floating food if you turn off water circulation during feeding (as recommended).

Now for the cons: Quality control seems inconsistent. Like some reviewers mentioned, one of my suction cups arrived cloudy and slightly warped. It still functions but looks used. Also, these are strictly for FLOATING foods - don't expect them to work with sinking pellets.

Final verdict? At this price point (for 2 rings), they're worth trying if you have: multiple fish species with different diets, a heavily planted tank where food disappears easily, or surface-feeding fish that need contained feeding areas. Just inspect those suction cups upon arrival!