Omega Supplements and Crystals/Blockage history

I wasn't sure if this should go in health or nutrition, so I flipped a coin and nutrition won! ;-)

I have a two year old male cat, Simba, who is prone to bladder crystals and blockages. His coat is just.... dull, and thin, and coarse. They're on a mix of 50% canned food (Fancy Feast and Nutro mostly with some Blue mixed in), and 50% dry food. They were on Simply Nourish Source dry food, but I changed to Solid Gold Indigo Moon when the Source was making his coat what it is now.

This is going somewhere, I promise.

So, after a month on the new food, no change in his coat. So, I was thinking I would add in some fish oil supplements. But, I remember reading somewhere years ago that too much fish in the diet could possible cause urinary issues in male cats. Seeing as how Simba is already prone, and they eat a variety of fish in canned food (as well as chicken, turkey), should I add in the fish oil?

Not sure if it matters, but I have three other cats, and all their coats are excellent.

I think Omega supplements would be ok....probably be great for Simba.  Not ALL Omega oils are fish oils either

I would l just ask your Vet what he might recommend, if anything, for Simba's coat.

Okay, thanks so much! :-)

I have a crystal kitty and a crystal dog and they both get Fish Oil daily and do just fine with it. 

From what I understand, the issue with fish is related to the mineral content of the fish, not the oil. So adding fish oil shouldn't be an issue. Most who make homemade raw or cooked food (which is often recommended for crystal kitties) add fish oil. Maybe your vet can suggest how much to add at each meal.