3 sick plants

[The Orchid Kid]

Hi

I have three possibly sick plants. First up Zygopetalum Louisendorf - it stuck a spike up, but the buds just came out black/brown and never opened, just dropped off. Leaves have some black marks, roots seem quite congested, but I know they like being pot bound.

Second is Laelia anceps var. Veitchiana. Repotted a month back because it was falling over all the time and fairly root bound. New growth is not looking good and old pbulbs getting black marks. Has never flowered since I got it two years back.

Lastly is Rossioglossum grande x R. splendens. Again not flowered since I got it two years back. Last years leaves failed to properly elongate and got a bit crinkly (you can see on right side of pic), but am more concerned at the black spots on pbulbs.

I have a number of other orchids all doing ok, but for some reason these 3 are not playing ball! I would greatly appreciate any help.