How can I have "bubble" back on a BTA

wzero

New member
My BTA had a great "bubble" appearance when I bought it half a year ago. After that, the BTA had gradually losing its bubble appearance. Now it has totally no bubble.
How can I get "bubble" back?
 
many have this problem, many have there theories.. for mine it is actinic lighting and feeding: both of these just make it bubble rite up... with all lighting on 250 MH 10K , it has no bubble...
 
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