Who says its not a good idea to house more than 3 different species together, sounds like your spitting garbage.It's not a good idea to house more than 3 different types of anything together, especially since many reptiles are known to be cannibalistic. And if you have all males or all females of different species, there will be constant fighting (usually) in some cases, maybe not.
NONE of these animals should be kept in a 125gallon AQUARIUM as an adult, they should be in something probably 4 times that size, let alone more than one together. You are talking about LARGE, ACTIVE lizards that need space.If you want color and similar husbandry requirements, Chinese Water Dragons can live with Basilisks and Sail Fin lizards farily nicely. They live in practically the same enviroment and need the same food, heat, similar humidity, as eachother.
You should consider knowing a little about what your talking about before giving advice, some poor person might think its ok to put 4 water dragons in a 125 gallon aquarium.
To the OP, buy fish, put them in the aquarium. Purchase or construct a PROPER habitat for your lizards. And please dont go off of one or two care sheets you find online, research, find a forum or group where you can talk to people about whatever your planning on getting and make sure you start off right.
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