I would have to agree and say a 35 gallon would be to small by the time the fish were of age to pair up. I believe bigger is always better.
On a side note, I think that you could use water from your 150 and fill the 35 gallon tank completely and avoid the cycling process. I've done this numerous times with my smaller tanks and never had a problem. I just filled them completely from my 125. threw a filter on there and that was it. Some people may say they wouldn't do it but I never had any problems with it.
On a side note, I think that you could use water from your 150 and fill the 35 gallon tank completely and avoid the cycling process. I've done this numerous times with my smaller tanks and never had a problem. I just filled them completely from my 125. threw a filter on there and that was it. Some people may say they wouldn't do it but I never had any problems with it.