Review on Optimized for SEO: Set of 4 Fish Feeding Rings - Square and Round, Aquarium Fish Food Feeders that Float, with Suction Cup by Christine Pochmara

I bought these mainly to discourage floating plants. Would love to have more choice of floating plants though so it's good to get four as most sellers only list 2 or 3. Mine fits in a 30 gallon. I have very bright light during the day so the floating frames/plants are strategically placed to provide shade for the fish below and some land plants. I didn't notice any weird smells as mentioned in some reviews. I also soaked/rinsed everything as soon as I opened them. Each was individually wrapped.