Are these nutes OK?

Just borrowed some Tomato feed from Frank (the dude nextdoor). It says to use 15ml per 5.5 liters, Im gonna start on half of that just to be safe. Im just wondering if these levels are OK?

NPK: 5-5-10.
It also has trace elements of Magnesium, Boron, Copper, Iron, Manganese, Molybdenum and Zinc. If you really want, I can post these amounts.

Always remember; it's better to under feed than over feed and lock out everything altogether. With that being said, half recommended strength should do it.