The weapon is dual-skill, and as such, is good by default. It wise to try and max it out incase Gacha one day decides to go "hey, have these two core Dark SSRs in three 10-pulls."

The chances of that happening are astronomically low of course, but it doesn't hurt to be prepared. I wouldn't spend any more resources (Seeds), but reaching 100 Reds has a good chance of getting you LMB on the weapon.