I'm setting up a new aquarium, I currently have 5 rummy nosed tetras in a 15gallon tank with gravel and riccia, I'm planning on getting a shoal 10 or so, new fish in a month or so once I've got the tank grown out and how I like it. It's an iwagumi style with soil substrate. I'm looking at: -Cardinal tetra -Neon tetra -Ember tetra -Rummy nosed tetra -Serpae tetra -Penguin Tetra (most tetras really) -Galaxy rasbora -Harlequin rasbora -T. espei (lambchop rasbora) (most small rasboras) Which fish would you choose? I'm not in a hurry but still haven't decided on what to get... I do want a nice fish that will school/ shoal well, it will be an almost species only tank with occupants of otto's or shrimp.