So i havent been on this form in a while,propobaly 4-5 months and have been planning on a 180 gallon.I planned to get a clown knife,silver arowana,florida gar,and maybe oscar and pleco...I dont know about getting the arowana yet but i defintely wanna get the clown knife and gar. Will this work? This will propobaly not happen for a couple months but just im just making future plans. -thanks

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Current Tanks:
90G,30G,10G,10G,5G,38G,20G

I'm thinking the gar and aro would have issues.

Those fish will outgrow that tank as well.
The clown knife alone can get 4 ft.
I have one in my 150 thats 6 inches, but am currently drawing up plans for a renovation that includes a 9 ft by 5 ft tank.

Unless you have plans for a larger tank, or have someone who can take them when they get larger, I'd consider other fish.

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150G, 1 shovelnose sturgeon 8", 1 polypterus endilicheri 9", 1 leopard ctenapoma 4", 1 Distichodus Sexfasciatus 6", 1 Farlowella acus algae eater 8", 2 silver dollars, 2 tank bred angelfish, 1 clown knife 11", 1 Jaguar hybrid syntadonis 4", 6 African cichlids 3+"