I grew a tig up from 4 to 12" within 7 months. I fed it feeder guppies, blood worms and mysis shrimp. Once it got to 8 ", I added it to my main tank, 350 gal with a my other fish. He then started to eat cut squid rings as well. He did great with that and was growing up nicely. Then I aquired a 16" ornate and once I added him, my tig was never the same. He would sit right next to the tig and im sure he basically made the tig uncomfortable and he started to slow down on eating til he basically stopped. I tried saving him, isolated him in his own tank, noting worked and he slowly deteriorated and that was that. Im getting another one in two days that I will do very differently with. That damn bichir is gone and ive gotten rid of some of the less impressive animals so now things will hopefully be better. It sux to loose one that u have watched grow up but s#@t happens. Lesson learned, but as far as seafood gose, Silver sides are a saltwater fish, still seafood. I think if u over do it or dont rinse the food off enough, u have a greater amout of salt in the food. I rinse the crap out of whatever I feed them as far as frozen food gose. IMO... all fish need a variety of foods, we dont eat steak all day every day, we eat a variety of foods so should fish.
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Like us, they need a variety of nutrients..not necessarily foods. Whole wild caught fish (like silversides for young tigs) are loaded with nutrients and provide all that is needed for growth and health. IMO the salt from the fish doesn't hurt them, but that's just my opinion. WC's are key when lots of whole fish is getting consumed in captivity. I'm sure in the wild, it's fish, fish, and more fish for them. So if whole fish is the only item on my menu for him, i don't believe it's a negative thing
But i guess when people are growing big cats of many types on HOTDOGS, seafood of any kind or style seems like a gd & safe option to me. Tigs might have to wait till they reach a foot to eat them maybe