Humus (note the spelling) is supposed to be broken down organic matter. Sort of a finished compost. It should be wonderful stuff for your plants.
I mixed a 50/50 mix of humis and cheap potting soil last year.
this was in 5 gallon buckets..
Sounds good to me.
broken bricks in botton by drainage holes....
Not a good idea. Take a look here.
https://www.puyallup.wsu.edu/~Linda%20Chalker-Scott/Horticultural%20Myths_files/Myths/Container%20drainage.pdf
it was my first time using humus.
the results were terrible.
only a few tomatoes ---and they were small.
Sometimes the Big Boy and the Big Girl will be undersized. Over fertilizing, especially if you use a synthetic fertilizer with lots of nitrogen, can also cause undersized tomatoes. I prefer organic fertilizers like fish emulsion or fish emulsion mixed with seaweed. It's gentler and feeds the soil that feeds the plants. Synthetic fertilizers feed the plants.
some had turned black on bottom..
[these were regular tomatoes]
The black at the end of the tomatoes would be blossom end rot. It comes from inconsistent watering and a lack of calcium. It's often more a matter of the type of tomato that this happens to as some tomatoes are more resistant to this disorder then others. Take a look at the first disorder here.
https://vegetablemdonline.ppath.cornell.edu/NewsArticles/Tom_ComDis.htm
Glad to know the cilantro did well.
Newt