I had a Raphael for a few years, i saw him once every few months. They are not active and are not showy. If you want friends for your goldfish consider dojo loaches, levebearers etc that won't bother it.
Originally being from WI I also had Lake Michigan as a source for many decades.
And I found the best species to keep with that water are rift lake Africans, and Central Americans.
Trying to keep soft water S Americans or most any soft water species was an exercise in futility for me.
And the type species found in my area at Milwaukee Aquarium society and Chicago auctions was very telling of the type fish that are successfully raised in that water.
Rift Lake Africans were always available and healthy there, and many will be acceptable in your size tank.
Central Americans also do well, but a 75 is very limiting as to what species will fit.
All of the species below did well in similar size tanks, in L Michigan sourced water.
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Yes wild type sail fin, males hit about 5".Those mollies are cute. Those the jumbo wild type?
I would not put any of the top dwellers you mentioned in any tank short of a 6 footer. These fish are made for speed pure and simple. I raised a Pink Tail from 2in to around 8in. It could end for end the tank with just one switch of its body. Here he is pacing around a 6ft 125.
Red wolf will go on patrol outside of feedings, but definitely isn’t the most active when not eating (or begging). Mine is always out front, but I can’t say what he’s doing when I’m not watching.Hello! Novice fish keeper here, only had 10-20 gallon community tanks previously but now I have a 55 gallon 4ft tank just getting established. I'd like to keep a pretty active predator so I can do live food from time to time, my young sons would love to watch and help out. But I'm hoping for something fairly active so my sons can watch, not something that will hide out all day and only come out to eat. That's why some of the top dwellers like Pinktail Chalceus, hujetas, or other pike/barracuda-like characins look like a lot of fun. But I can't go much bigger than the 4 ft, and I see you're recommending against smaller than 6ft for a PTC. I'm totally fine with a keeping just 2-3 fish or even a single fish in there if it's gonna be active and healthy, but I know some of those top-dweller types do better in numbers too. Just wondering if you have any advice for a similar active predatory fish that might fit what I'm looking for?
I've also considered a red wolf. Sounds awesome, just concerned it may not be the most active/fun to watch for my kids when it's not feeding time. But otherwise, seems like it would work well in a 55 gallon and is a ferocious predator so definitely fits what I'm looking for.
To be completely honest I like the pike/barracuda or the ancient predator wolf fish type of look, so I haven't dug too deep into the cichlid game. But I'm definitely open to suggestions if anyone thinks something in that mold would fit what I'm after! The pike cichlids look pretty cool. I just have this 55 gallon 4ft limitation, no space to go bigger than that.
Looked into exodons too, I know they're little savages and great to watch. I guess they'd be a fall back if I can't find a slightly bigger predator I like.
Thankful to have this community of experienced MFKers to help me make sure I find what I'm looking for but still do right by the fish!