The Bucktooth Tetra (Exodon paradoxus) grows to around 4.5 or 5 inches. A set up 5 gallon (nominal) tank would only hold a maximum of 4 gallons. (No water in the top 1inch and water displaced by gravel substrate at bottom). So using the basic Aquarists rule of "1 inch of fish needs a minimum of 1 gallon of water". Even pushing the limits, the tank is not big enough to house a Bucktooth tetra. The recommended tank size for them is around 30 Gallons.
No, don't risk it. Serpae tetras are fin-nippers and they'll constantly stress out your Betta. Especially in a small tank such as an 8 gallon, I would find something else to go with the serpaes. (:
yes they can but they have to be in a ten gallon tank or 17 gallon you can fit one inch of a fish per gallon
I can't have another tetra in my tank.
You could put the following: 3x Neon Tetra or... 1x Betta
Personally, I wouldn't keep anything in a 1.5 gallon tank. Not even a single Betta. I consider 5 gallons to be a minimum for a single betta.
ghost shrimp,
You don't! What you do is get a 55 gallon tank because angelfish won't be happy in a 10 gallon tank, and then you take the betta out of the tank (it will fight with your other fish) and just get more mollies and put lots of hiding places in the tank so the babies will live.
mollies, tetra's, plecko's mollies, tetra's, plecko's
No. A 10 gallon tank is barely big enough to keep a single goldfish in.
a 10 gallon tank with land and water so it can swim
2 or 3
If you have six pregnant guppies then yes, they will give birth in your five gallon tank. That tank is not big enough for all of them to live in and the guppies will keep having babies. You will have to give them away, sell them back to the fish store, or get a much bigger tank if you plan to keep them.