in my own opinion, I wouldn't even bother with a predator tank unless its 125g or bigger. only reason I say this is because a majority of the true "predator" fish get huge. (triggers are 10+ inches, some hitting 15-18", lions can hit 15", dwarfs are closer to 7-9", groupers and puffers 12+, non-reef safe wrasses 12+) even at 125 you'll fill up quick. also if you are going to do the predator route id def recommend going the drilled tank route. this will help with running a big sump/refugium underneath (my 125 has a 55 sitting under it) also, as stated previously, utilize craigslist as much as possible. people are always selling their fish stuff. just make sure you watch out for scams/broken equipment. come back here if you have questions about a possible purchase. the 2 places I wouldn't skimp out on are 1) amount of rock and 2) skimmer. your fish are going to eventually get pretty big, and create a ton of biowaste, an undersized skimmer will not only be less efficient but also will require more upkeep and maintaince. if you go with a 125, look for a skimmer rated around 200-250 gallons. the best part about predator tanks (and fowlr
in general) is that you can get away with a lot of stuff that you cant in a reef tank.for instance, flow really isn't as important (nothing requires it for survival) and your lights will be strictly for viewing purposes, therefore allowing you to light the tank with whatever form of lights you like.