The 'Tanks' command is designed specifically for use with tanks. Also, for any command, the name filter for blocks should be contained inside { }. This is especially important if the name you're trying to filter has spaces in it like your example above, otherwise it'll only look for the first word.

Example
Tanks {Hydrogen Tank 1} Hydrogen - will return only tank called Hydrogen Tank 1

The way the game handles tanks is to auto balance them between each other when connected, unless one ore more are set to stockpile, so generally you only really need one readout which will show the overall capacity of all tanks on the grid, like this;

Tanks * Hydrogen

As always, full details of the command's functions are in the guide under the heading "Command: Tanks"
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=407158161

When I inputted the info with brackets, I ended up with a list of all items with hydrogen and no info on them. Just a scrolling list of names. It’s was odd.