Originally Posted by Tropical Trav
What other species would go wll with the Glass Cats? I would like to maybe get 6 Neons and another small school of something else if possible.
I would up the neons, say 8-9. "Six" is the usual minimum number mentioned for tetra, but if space allows then having more will always be better for the fish and you. The more there are, the more "relaxed" and normal the fish will feel/behave, and that means you will see them as nature intended, interacting, brightly coloured, etc.
Can't remember if it was mentioned earlier, but make sure there are floating plants, lots of them, over these fish (Glass Cats and neons, and other forest fish). Water Sprite is ideal for this. Fish love its dangling roots, it is attractive, and a good source of microscopic food.
If you read the data in the Glass Catfish profile, it mentions slow-flowing shaded streams as the habitat, so suitable fish will be those preferring a similar environment. The neons fit this. Others might be rasbora such as Lambchop Rasbora or Hengels Rasbora, even the slightly larger closely-related Harlequin Rasbora; Lemon Tetra would add a bit of different colour to the tank. Loreto Tetra. Marble Hatchetfish or Black-Winged Hatchetfish--these two in the Carnegiella genus are smaller and quieter than the larger Silver so a better choice. You mentioned the Black Widow earlier, and as Izzy noted it is a bit boisterous, but something along similar lines in appearance is the Black Phantom Tetra.
I don't think the tetra I've mentioned are likely to fin nip the Glass cats, provided the tetra are in a decent-sized group, 8 or so of each species selected.