I'm going to go out on a limb here but the OP said they liked the iclear 16 except for the tank size. Simple solution would be to get a few extra iclear 16 and carry spares already filled up....
Then if they wants to experiment with a bottom coil, vivi, T2, T3 or anything else, buy one and see how it performs. Meanwhile stock up on what you do like because it may not be available when the next latest - greatest fad hits the carto-clearo fad....
...
Then if they wants to experiment with a bottom coil, vivi, T2, T3 or anything else, buy one and see how it performs. Meanwhile stock up on what you do like because it may not be available when the next latest - greatest fad hits the carto-clearo fad....

