Just to try and clarify, here's a photo of the three tray sizes I use
Small black = Half tray
Green = Standard seed/ gravel tray
Large black = Double tray
I hope this helps
Note:- The start of the tapes are at the tray edge, it's the angle of the shot that makes them look like they're overhanging.
GM means genetically modified and GMO is genetically modified organismWhat's GM/GMO mean?