Alas,
) it seems that otos, like corys, swim in packs.
Otos, Pygmy Suckers Otocinclus spp., Zebra oto. Parotocinlcus spp. Again a shoaling fish that should be kept in a group minimum of 5 or 6, an effective algae eater. Find out more about acclimatizing these to your tank here. Require algae or vegetables to eat. Parotocinlcus are not as shoal orientated but do prefer to be kept in trios or more.
If you buy the Parotoclincus (assuming it is available) and go with the three recommended, plus the 2 honey gouramis, you are probably leaving room for 6 to 10 neons -- and that might be stretching it. I am not familiar with "amber neons". Is that by any chance an albino neon? They will probably school together, but I am not even remotely an authority on neons. All I hear is, they seem to die a lot
and they have been much overbred, so be careful. They also like soft water, I believe.
An alternative (to the otos) might be to get an
uncommon pleco (one that stays small), since I am pretty certain they at least can be kept by themselves. I don't know that they will clean the bottom of your tank, however, being more the algae eaters. Maybe the snail was a better idea, after all!
Well, whatever you end up getting, the plants and the neons will render your tank outstanding to look at, and that is really the idea, isn't it? Best of luck to you and your fishes!