dwarf loach

Hi I recently bought a 90 litre aquarium and it currently contains 5 Neon Tetra's the amonium and nitrate levels are all 0 and the fish seem lively and happy. I am planning on gradually planning on building up my aquarium to contain 10 Neons, 3-5 Platy's, 3-5 Guppies and 2 Dwarf Loaches. I have...