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It is not harmful. But if you want to clean up the algae in the tank you want to get a pleco. They are very peaceful fish and will not harm angelfish. I have a pleco and three angelfish in my 35 gallon tank right now and they get along great!
Absolutely. Angels tend to inhabit the middle areas of the tank, while plecos stick to the bottom. They can live side by side for many years. The only time there may be conflict is when a pair of angels are spawning or already guarding a clutch of eggs. The angels will attempt to drive the pleco away from their nesting site (and rightfully so since the pleco would be more than happy to dine on caviar!) Depending upon the size of the tank and the availability of hiding places, the angels can seriously injure or even kill the pleco in this scenario, but this is true of just about any other fish trapped with a pair of breeding cichlids, a family of fish which includes the angelfish.
Yep! They'll ignore each other. Better have a big tank ready for the pleco when it grows, though.
the bigger the tank the bigger it gets
I dont get it. Did your angelfish die?
Angelfish are very aggressive fish. They are also very territorial. They want their own space and the whole tank if they can have it. I'd suggest that if you have a small 3 to 5 gallon tank you get a bigger tank as that size tank is too small for Angelfish.
To maintain or gain leadership in an area, probably your tank.
Anything that's bigger than them. My angelfish is afraid of the light over the tank.
No. Plecos are omnivores and scavengers by nature.
Angelfish are clever fish, from my experiences if you put your finger up top of the tank they will follow it.
yes, but angelfish will also be attacked by parents of the baby fry, not compatible
No...betta fish are usually aggressive and might kill the angelfish.