The lid did NOT fit the 20 long tank I had. At least 1/2-3/4” too short in length. Plus one piece of glass is much narrower than the other to the point that I can barely get my arm in the 29 G Imagitarium tank I bought instead of the 20 long I planned to use. I’ve now purchased a 20 long Aqueon brand lid since that should fit. It hasn’t yet arrived to check the fit. Frustrating that the Imagitarium lid still fits quite loose on the Imagitarium 29 G tank. I had to add some strips I had from a different brand lid that makes them fit more snugly.

this will not fit the Aqueon 20 gallon tank! buyer beware!

The lid itself seems to be fine quality and fits my 20g long Imagitarium tank. I'm currently using an Aqueon 125gph (Large) filter for 20-30 gallon aquariums, and the glass portion of the lid doesn't quite fit even when pressed right up against the filter. The opening lid rests slightly up on the rim rather than in the groove. I will have to see if I can find a filter that fits.

Fits great and just what I needed for my aquarium.

Fits great length and width. Slight bow along the back piece causes it to not sit completely flat. Minor but a great product nonetheless.

I bought the 20 long/29 gallon imagitarium gl top. It fit the imagitarium aquarium perfect. Someone said they couldn't put a hang on the back filter. I bought a flaval aqua learn ac 30 hang on the back filter fits with room to spare.

I bought the 20/29 gallon size for my imagitarium 29 gallon aquarium. It fits perfect. I did read the review where they couldn't put a hang on the back filter on with hood. I had bought a fluval aquaclear ac 30 and it fits great I have no complaints so fat. The glass is a little thinner than the aqueon top. It fits perfectly.

Although it says it fits Imagitarium brand only, it was a perfect fit for my Top Fin 37 gallon from the competitor. 25 years ago tanks were all the same size. Now each brand is just a little different.