The guy at my local brew shop recommended that after primary fermentation is complete I add isinglass to carboy then siphon my beer to the carboy and stir gently then let it sit for a week before bottling!
So what should I do next time? Just wait for primary fermentation to finish then bottle directly from the primary fermenter? What about if I wanted to use some clarifying solution? Both of the clarifying solutions I get at my local brew shop include mixing in the carboy..
I wait until fermentation is complete, then I wait some more because doing so lets more yeast and trub settle out and that trub to compact somewhat so I don't get much transferred to my bottling bucket. I make sure to keep the exposure to air a little as possible by laying the siphon hose on the bottom of the bucket with at least a partial turn so it doesn't splash (splashing is really good for getting oxygen into a liquid) but swirls around gently. This swirl helps to mix in the priming sugar.
You can add the isinglass to the primary fermenter but be very gentle if you stir it in. Leaving the beer longer in the fermenter will settle out the trub and you will find that the isinglass isn't very necessary. Since you have the carboy you will be tempted to use it. I suggest you use it to make wine or better yet, mead. That will keep your carboy full for quite some time so your desire to put beer in it will be quenched. While you are waiting for that wine or mead to finish, buy a couple more fermenters. I like fermenter buckets and they are not terribly expensive. With that you can brew more often and that brewing will take up some of your free time so the beer in the fermenter will have more time to complete fermentation and settle out. My beers usually stay in the fermenter for 3 to 4 weeks.
When I transfer to the bottling bucket, the beer often stays there for a short time as I prepare bottles and sanitize the caps. That lets any trub that the siphon may have sucked up to settle back out. If I try to get every last drop of beer bottled, that last bottle will have more trub.