The best fish is the one(s) YOU like best, as long as your tank is big enough to house them! Glow lights will school with neons ,adding a bit more colour, Pearl gouramis are gentle and a nice feature in med. size tank. Visit LFS and see what is there. Some people like a large mass of the same type of fish with one or two larger feature fish and a couple of bottom cleaners, others seem to want at least one of everything!! New tank... the choice is all yours, remember different species can require different water conditions and filtration rates.