recommendations for what tomato feed.

I use Epsom salts too for any magnesium deficiencies.
I am trying the Levingtons tomato specific grow bags this year, some very impressive reviews for these .
They contain slow release Levingtons Tomato feed and as this gets used up then top up with more Levintons, or whatever you wish.
I will have the bags on greenhouse staging with canes hanging from the roof for support. Its a timber greenhouse so getting a fix for the canes is easy.
Trying Brandywine yellow, Black truffle, white cherry and Sweetie cherry and Marglobe.
I will also be growing these in an outdoors batch as well, so be interesting to compare the two growing conditions.