>>2713675>Are 3inch tomato seedlings considered leggy?Look at those tomatoes, can you see how they all have different size despite being kept in nearly identical conditions?
None of those are leggy, they are different because they are different cultivars, smallest are small even for dwarf cultivar, medium are semi-determinate and largest are indeterminate.
Point is, it's hard to tell without a photo if seedling is leggy.
>should I thin them out or keep them in threes?You can but you can also wait, you could also separate them into different cells to have more seedlings.
>Also, if they ARE leggy, should I bury them deeper when transplanting or do tomatoes not like such things?You can do that, tomatoes will grow roots from stem, in fact if you damage root system when transplanting I would recommend planting deeper.