Aiming4 Goldfish Care

The last few mornings i have noticed that my fish has a new split in his fins and one or two scales missing. Is he being bullied? They both seem otherwise healthy, it always seems to happen at night as i havn’t noticed any aggression during the day.
I have had problems with keeping nitrate levels [...]

such as a veiltail
i have done alot of research already
so i learned how to care for them properly
i’ve raised a flowerhorn and a frontosa for about 4yrs
i seriously want to know where to buy these exotice beauties!
i live in houston, texas btw :D!
thanks

I have four fancy goldfish which have not all been together during the mating season in April.
I am unsure of sex of fish , Can you tell their sex when not in mating season?
Is breeding goldfish very difficult for a beginner? Any tips on breeding fancy fantail goldfish would be very helpful .Have watched Expert [...]

The other fish are just goldfish. Before I realized it, I loss a bunch small fancies to snakes. They were just two slow. Now that they a larger can they be put back out in the spring? Or, do I keep them inside in ever larger tanks. They are 5X the size they were. Can [...]

i fink the fighting (2 orandas n 2 standard gold fish)

goldfish is 7 inches.

Do i take him out will they all get used to one and other???

1.I have 2 fancy goldfish and i wanted to know how they are ment to act?
2. is it ok to have my filter on a high power seen as that gives more air bubbles to the tank, but when it is high the fish go up to it and literaly get blown away by it, [...]