Hi, i just started a 20gal high tank, i bought 16 fishes, 4 died within 2 days, 2 angelfish and 2 others, i have some neon tetras and some red swords, and couple little yellow fish i dont know the names, i want to start planting this tank but i have no idea where to start, i will try give the best information for you guys to help me, i have the Perfecto flourence light, its 17 watts, 30-60 gal filter, heater, air pump, and 1 artificial plant. what should i start with and how? thanks!