IMO its viable, 60 litres is 15 gallon. My 15 gallon doesn't even have a filter. On such a small tank, weekly water changes are the best form of filtration on a nano tank. My 15 gallon has a pair of sicce voyager powerheads, a heater, a light, and an auto top off, thats it. I find it very cheap and easy to run this tank, and honestly and sadly this tank look so much better than my main tank that gets all my love and money. The light is the most expensive component by far.
Buy used rocks cheap from another hobbyist and bleach all the rocks before using them. Buy new sand, but you only need one bag of sand for that size tank. Buy corals from local hobbyists, used the online classifieds from your area.