No, it is not recommended to keep plecos with axolotls in the same tank as plecos may nibble on the axolotl's gills, causing harm to the axolotl.
Goldfish should only live with goldfish with the exception of weather (dojo) loaches, bristlenose plecos, or mystery/apple snails.
no
An Oscar needs at least 55 gallons, and common plecos can grow to a foot long - you must make sure you have enough filtration for this
yes they do because they live in itall though fill a tank about halfway to ensure it can breath
No. Goldfish are cold-water fish, plecos (which are catfish) and your other catfish are warm-water fish. You run a heater in a pleco/catfish tank, but no heater in a goldfish tank. Plecos are also territorial toward conspecifics, meaning two plecos in one tank will fight and possiibly kill each other. The other problem? A 50-gallon tank is only large enough for one pleco, even if they weren't territorial. I would return one pleco, either the catfish--what is it, a bagrid?--or the other pleco, and the goldfish. If you want to build a community around one of these big cats, try some medium-sized tough cichlids like Jack Dempseys or firemouths. I kept three Dempseys and a pleco in a 55-gallon aquarium for years, and they were great together.1st: Plecos are catfish.2nd: Goldfish can't live with any other fish besides other goldfish. 3rd: What kind of Catfish is it? 4th: 1 pleco per tank only!
Normally, Bettas and Rubberlip Plecos aren't recommended to be tank mates but if you think that they are getting along fine together then that is OK.
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.
No. Plecos are omnivores and scavengers by nature.
Cold to a certain degree (no pun intended). Plecos can withstand a pretty wide range of temperatures as long as it is a stable temperature and if different from current slowly lowered. They do best however at around a 76 - 80 degree F range.
No more than one adult. I recommend a larger tank, though.
Oscars can live with plecos, but careful consideration is needed. Oscars are aggressive and territorial fish, while plecos are generally peaceful bottom dwellers. It’s important to provide ample space and hiding spots to minimize stress and aggression. Additionally, ensure the tank is large enough to accommodate both species comfortably.
Unless you have a 100-gallon tank, I would say corys.