I have G-3 for 90g and ASM Mini for 20g:
- they are big and produce a lot of the finest bubbles (what else one should want from a skimmer? 9 for this.)
- the water in my tanks is still not clean,
- the skimmer needs at least gate valve mod, for re-routing the cleaned water to the return pump and having less water on the floor during adjustment,
- mine in the side sump needs babysitting, even with the same water level, without turning pump off. Otherwise or overflows, or doesn't collect anything - the foam is going 2" down in a few hours. Have no explanations why it's happening, but have no time for this.
Will try to make a gravity fed DIY skimmer and replace my ASM's.