What should I do?

All of your life , if a photo never see a 12/12 schedule she'll never make buds ! I've been told that the original cheese tree is still alive , and many others legendary strains are too. The problem that will occure there is that you 2 others plants will get stretchy to reach the light as the 4 month one should be tall at that stage so put them higgher ( on a pot for example ) for them to be close to the light and avoid stretching

However big it is now...it will doubled to triple in size three weeks after flip...Would love to see how big it is already lol.

For as long as you have space for it. After 4 months I doubt anyone has enough light to flower that monster; your best bet is to take it outdoors, even better, transplant it before you do it

hey, you can keep it very long if you keep your vegetative with photoperiod plant 18h6

can you take the little ones outside into daylight giving them extra hours and turn tent to 12/12. you can keep a plant in veg indefinitely pretty much