Ionic boost?

Only got 4 weeks left in flower ,been feeding canna a b , liquid oxygen
Iv read that if use my canna boost
Be pointless ,if I use ionic boost think same brand as oxygen
Will that be ok boost work?

It should work but you still need flush time I’d say half strength for the first week or two then start to flush and maybe give a couple extra days of clean water

You do not need to flush.