Flag: Zero source content. General Cryptocoryne retrospiralis facts used below. Cross-reference: a "Cryptocoryne Spiralis/Retrospiralis" species-identity flag was raised earlier in this pass (Batch 10) on a different listing where title and body named two different species — worth checking both listings together. Skill Level Moderate CO2 Optional Requires Aqua Soil Not required, but recommended Type Rooted (Sword/Crypt) Max Height 12-20" Placement Background Light Level Low to Moderate (approx. 20-50 PAR) Origin South Asia (India, Sri Lanka) Other Distinctive long, narrow, spiraled leaves. Care & Planting: Plant the rhizome/root system in nutrient-rich substrate. Cryptocoryne prefer stable water parameters and established tanks.A note on melting: Cryptocoryne (as well as Amazon Swords and other Echinodorus) can experience "melting" — sudden dieback of leaves — after planting or a change in water conditions. This is a normal stress response; leave the root system in place and new, tank-adapted growth will typically emerge within a few weeks.