Black moor is nipping the veiltail goldfish

My black moor is nipping Veiltail's fins. I currently have separated them but the tank I have kept black moor is just 7.5 gallon. Black moor is just 1 - 1.5 inch so I don't think for time being she/he will have any problem. But I'm concerned if after sometime should I add it back or not.
I was planning to have one more black moor but I think it will be stressful for Veiltail...
I would really appreciate some suggestions!!!

On the other hand my Veiltail has ich and due to that I lost my fantail today. I'm currently using the method of increasing the temperature, salt and Rid- ich. Is there anything else that will help? Yesterday I tried to do water change but today the number of spots increased.

Another thing is that as I lost fantail today my Veiltail seem to be unhappy. What should I do?? Should I introduce a new goldfish to her??

 

Sorry for your loss of your fantail, I've also lost fish before so I know how that feels. However, you definitely should not introduce a new goldfish to the veiltail especially when she has ick, ick spreads through water, so the ick is going to spread to the new goldfish, your veiltail looks "sad" probably because she is sick. I suggest you continue your treatment, and when your veiltail recovers from ick, you could probably introduce a new goldfish, that being said, how big is your tank? Also black moors usually are docile creatures, so it seems strange to me that it would attack your veiltail. My advice is you should first make sure that your veiltail recovers, re add the pre-existing black moor and make sure that they don't have any problems with each other, and then possibly add a new goldfish.

 

Thank you for this advice.... Now things are little clear for me.
My tank is 34 gallons... I had only 3 in that ( 2 were about 2 to 3 inch and black moor is 1 to 1.5 inch )

Okay so when I introduce the new fish... Is it okay that if it will be only femal Veiltail??? I do not want that chasing thing!!! That is tiring... My current Veiltail is female and I want another to be female Veiltail too!

 

It is very hard to accurately sex goldfish at the sizes you are talking about.

 

Here is an update!!! So, my Goldfish didn't had any disease she was pregnant!!! It was my first time so I couldn't recognise the signs but that laziness was because of pregnancy and her poop problem hasn't occurred again. The Fantail which died due to ich was a male these are his. But unfortunately he is not here so they won't be able to become fish.

My sister was too excited to see them ( she thought they will just hatch anytime) but I yold her that that will not be the case. And yo be honest I too didn't wanted to breed as it is a responsibility of hundreds/thousands. I think I'm not able to carry that right now. May be in future.



But thank you for your

Sorry for your loss of your fantail, I've also lost fish before so I know how that feels. However, you definitely should not introduce a new goldfish to the veiltail especially when she has ick, ick spreads through water, so the ick is going to spread to the new goldfish, your veiltail looks "sad" probably because she is sick. I suggest you continue your treatment, and when your veiltail recovers from ick, you could probably introduce a new goldfish, that being said, how big is your tank? Also black moors usually are docile creatures, so it seems strange to me that it would attack your veiltail. My advice is you should first make sure that your veiltail recovers, re add the pre-existing black moor and make sure that they don't have any problems with each other, and then possibly add a new goldfish.

help.