How to keep Goldfish with sharks

Question
Dear,
I am a new begginer with aquarium. First i made the biggest mistake by buying aquarium and fish at a time but water is helathy as i change 40% water every week. Please guide me what do in following conditons
Status
Tank: 23 gallon Tank
Heater: 300w automatic
Filter: Power Filter (Use 2hrs per day)
Pump: Power Pump and air stone
Fishes:
Gold Fish: 5
Sharks(Pure white Color): 2 sharks of 6inches
Silver & black Color Shark: 3 sharks 2 inches
other fishes looks like tropicl: 4

Dear i faced the problem in the beggining as i over crowded my aquarium and my 2 orange color goldfish and two black big eyes goldfish and a sweeper died with in a week of setting up a aquarium.

Q#1 Do i keep Sharks (Full White color 6 inch)with Gold Fish?
Q#2 I put the temprature at 28c which is suitable for sharks and tropical type fish but not for goldfish, what to do?
Q#3 What to feed them, i am currently feeding them pallets and dried shrims.
Q#4 What is the basic formula to feed a fish?
Q#5 I didn't cycled my tank, what to do know, do i have to cycled it again?
Q#6 Did Goldfish survive in 80F or 28C temprature.
Q#7 which type of food do u sujject as i read vary to the diet of fishes?
Q#8 one of my Shark dont eat food and stay at bottom when i feed my fishes?
Q#9 I have pure white color 6 inches shark fish. which kind of shark it is & what its characterstic?
Please do reply me as soon as possible. looking for your kind guidance.
Still my remaining 14 Fishes are healthy and doing well;wish to maintain them healty through your kind guaidence.
Thanks and regards,
Zulki

Answer
Hey Zulki

Your tank is really overstocked.  I would choose either tropical or coldwater.

If you choose coldwater, get rid of all your goldfish but keep one, that is all you will get in a 23 gallon.

If you choose tropical, you will have to get rid of all the goldfish as they are incompatible with your tropical fish.

Your shark choices are very territorial and it won't be long before there are deaths.  I would get rid of them all apart from one and just keep the black coloured shark or otherwise known as red-tailed black shark.

Q1.  No they are in compatible.
Q2. Get rid of the goldfish as they are coldwater not tropical.
Q3. What you are feeding is fine.
Q4. Once-twice a day just a pinch of what they can eat in under 3 minutes.
Q5. No just keep up your water changes.
Q6. No, it was way too hot for them.
Q7. Pellets for your sharks or flakes for you goldfish.
Q8. The other sharks are attacking it as they are territorial!
Q9. Albino rainbow shark.  territorial aswell!

Sorry i have been a bit harsh but you rushed into getting fish before researching them.  Please try and re-home your fish or split the sharks up and I will be glad to help you start again :)


Hope all this helps and Good Luck        Jack