I am looking for some fish to add to my 10 gallon tank that has two mollies. I want a fish that is easy to take care of!! There is also about eight molly fry in the tank!! yay

I brought a 125 gallon saltwater tank. It came with a wet/dry filter, overflown to sump, 1500 GPH pump, power head and etc. It is very dirty and has salt and algea. I want to transfer my freshwater discuss, neon tetras, pleco into this tank. My concern is the discuss fish. Can they live in this system? Is the wet/dry filter appropriate for them? How do I go about cleaning the tank? Any advices are welcome.

i know there is: fish only, invertebrate, and reef.
i really don’t know the difference. can someone explain please? thank you.

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