Corydoras, rasbora and tetra natural planted habitate ideas

[Aurrida]

Hello,

I am planning a naturally planted aquarium, 100 x 38 x 45(h), in which I want to keep panda corydoras, harlequin rasbora and bloodfin tetras. Lighting will be 2 T5's and it will be low tech.

I am looking for ideas on what planting and landscaping would work well with these fish. I plan on a sand substrate and attaching as many plants to wood or rock if suitable.

Any experience on what the fish like and what works well? Any idea of numbers of fish I could keep with an external filter set up?

Thanks