It's a matter of preferance really, as long as the substrate does not injure the barbels of Corydoras.
Some say bare tank would do fine
Bare tank is fine, as long as there is nothing that can injure the barbels of Corydoras. Cleaning is easier. However, some Corydoras often dig the substrate looking for food. So you will miss seeing some of these interesting behaviours.
Some say put fine sand is good for cory but not good for pleco
Plecos, generally the larger ones, will kick up a storm as fine sand is too light. The sand may in turn get sucked up into your filter. Mileage will vary with smaller plecos.
Some say pleco need big grains sand and pebbles to be fine
Larger grain sand is heavier and plecos will have a more difficult time stirring them up. Again, as long as they aren't sharp, it will be okay for Corydoras.
Some say using normal planted ADA/GeX is ok
They can stir the substrate and make the water cloudy. But the cloudiness would come and go, so if you aren't too particular, there shouldn't be any problems.
But pleco should need more netural water ?
All of them will do okay in water close to neutral. In fact, many fishes do. Some plecos can be housed in alkaline water, but mostly, acidic water is closer to their requirements.
Would blood worms, BS and frozen shrimps (for marine) be ok for them as well?
Not all plecos are carnivorous. You will need to identify the pleco species and their specific requirements. Corydoras would probably eat just about anything.
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