Hi is 4 pots of 15 l too much for my 60x60x160 tent!?

Are we talking centimeters here? Good god almighty! The most I would grow in a 2x2 tent is 2 plants... TWO.... the most I put into a 2/4 is 3... You need space for them to expand and grow - the air flow needs to be good if you don't want fungus and bud rot issues... you need space to work with them... and they need good light! I grew 2 Tangerine Dreams in my 2x4 tent - and at the end, had to give them each their OWN tent and they were still filling the space... There are so many things that may go wrong and need your attention, don't make cramped space one of them at the outset! If you want different varieties, great - grow two varieties, one plant of each....