I have never had issues growing tiger lotus... How many WPG do you have.... Are you using any ferts? Tiger lotus are usually grown from bulbs, were they get the majority of there nutrition early in life, if yours has no bulb it is probably a daughter plant, they do require good ferts and a rich substrate IMO. You could try adding something like a substrate fert....
120g, Flourite & Sand. DIY Stand and Canopy. CF lighting 3wpg, Pressurized C02, DIY reactor. 2-XP3's, 500watt heater.
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