My swords are melting and looking for advice. 40 gal, low tech planted tank 9 months old, fluval stratum base, gravel cap, ph 7.4, gh 7, kh 4, nitrates 5. I added root tabs 1 month ago. I have brilliant Rasboras, dwarf emerald Rasboras, Amano shrimp, neocaridina shrimp, nerite and mystery...