Yes I think the 180 will work for quite awhile but all the pike species you want to keep are notorious for being extremely aggressive. Also all those pikes can reach 16 inches+ or more. While there are examples of calm individuals many lenticulata and Jegui and cf. Jegui are reported to be very aggressive. Marmorata are also pretty aggressive but I haven't heard as many horror stories. Probably because they're so rare I guess lol. I do remember someone's Jegui was trying to decapitate his eartheaters by grabbing their heads and visciously shaking them. They aren't very active but easier to maintain than lenticulata or marmorata. Lents and marms can be susceptible to neuromast and lateral line erosion aka hole in the head as they age. They need cleaner water and lower nitrate. But they are much prettier and active. Personally I'd get the Rio Trombetas marmorata snookn21 has right now best bang for your buck they're only 4-5 inches right now you can even throw a small one in a 20-40 breeder temporarily and they aren't very aggressive at this size. From scatocephalus a member here's experience on them I wouldn't do a Jegui unless it was a good price. He reported them very easy to keep but very fearless powerful fish not afraid of anything to the point where he thought they won't even coexist with a large dovii or red devil. He said they're fairly boring and mainly wait for food lying on the bottom. If you get any of those pikes make sure that the filametosa barbs are big enough not to her swallowed. Good luck pikes are awesome fish that deserve more love on the forum
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