Id like to know too. My lotus is doing something similar.
For comparison i have:
30 gallon
2.6 watts pers gallon ( 2 t50 39w bulbs)
dry ferts using EI dosing
excel daily at 5ml
However my lotus is only a week old and got it from a tank that used pressurized CO2. So mine is probably melting back to adjust to its new tank parameters. Since yours is older my guess its a deficiency. Either light or co2... if mine perks up after i get co2 i will lwt you know
For comparison i have:
30 gallon
2.6 watts pers gallon ( 2 t50 39w bulbs)
dry ferts using EI dosing
excel daily at 5ml
However my lotus is only a week old and got it from a tank that used pressurized CO2. So mine is probably melting back to adjust to its new tank parameters. Since yours is older my guess its a deficiency. Either light or co2... if mine perks up after i get co2 i will lwt you know