99% of people would suggest running RO water.
Tested it with what?
Your water will have Chlorine or Chloramine.
Your water won't have a TDS of 0 (or anywhere close, mine is super clean and gets around 100).
Your water will have nitrates.
You might find you have some copper in there as well.
And it will have various other metals.
In the long run, RO will probably save you the hassle of battling with algae and the like... 130L isn't that big, it will be harder to maintain stats with the smaller volume. If you get a smallish RO unit (3stage+DI 50GPD) it will last you quite a while and be cheaper than buying/transporting RO and dealing with algae. Price for that - around £50 maybe less.