with 0 kh and gh a little buffer would go a long way
many shrimp keepers would likely love to be in ur position!!
kh to at least 1-2 is ok. for most plants 2-4 range is perfect
gh 3-5 is perfect
also ph will need to drop a little more for a green drop checker. the ideal floating around is a 1.0 ph drop for a green DC