Unless you have a 100-gallon tank, I would say corys.
no cories cant interbreed with any of those fish. bronze cories breed with bronze cories
1
No. Plecos are classified as herbivores or plant eaters. They are also bottom feeders.
rams, cardinal and rummynose tetras, corydoras, and BN plecos those are the best, there are a few other, but take caution
yes
no
no plecos will die
a catfish will eat any fish that is 3/4 its size.
The fins are larger on the sailfin...but almost all the "common plecos" (Hypostomus plecostomus) on the market are actually sailfin plecos (Glyptoperichthys gibbiceps).
You shouldn't expect the plecos to survive just on algae. Get some bottom feeder pellets for them. They need food. Also, that tank is much too small for two plecos, let alone six other fish.
Yes, but make sure that you have enough filtration for the bioload as plecos are pooping machines, and the plecos need to have driftwood in the tank to aid in digestion.
They will go fine - try to use a fine gravel so that the cories can root around nicely - maybe even consider adding a few more cories? bring it up to 5 - they will be much happier. Keep the PH at 6.5 - 7 and make sure the ghost shrimp get enough food - they can starve. Good luck