If one of your fish has a disease, it will pass the disease around. The disease might kill your fish(s). The one fish you are talking about must be stronger.
No, red tailed sharks get too large to survive in a 1 gallon fish tank. Only very smally fish such as endlers or guppies, or a betta, would be ok in a 1 gallon aquarium.
A betta fish is the only fish that can stay in a bowl :) hope I helped :)
Remove the sick fish..... the fish that has the ich should be put in a hospital tank then treated for ich, corals do not get ich, only the fish, so a ten gallon tank with a aerator would be ideal for a hospital tank....
Only 1. Usually a Betta is all that is kept in a 3 gallon tank
A half-gallon is 64 ounces...so, four drops.
1.5 Gallon? That is a small tank even for a betta and two neon tetras. A typical rule of thumb is 1 inch of fish per gallon of water, so you should only have 1.5 inch of fish. A betta is 2 inches or more, so the neons would be asking for trouble. Both type of fish are great, so my advice would be to get a bigger tank and put them together. Neons are schooling fish and would like to be in groups of three or more.
Working on a basic rule of fish keeping which is "1 inch of fish needs 1 gallon of water" you have room for only 1 zebra in such a tiny tank.
You should only have 1 fish per gallon of water in a fish tank. I wouldn't put more than 2 or 3 Neon Tetras in a 4 gallon aquarium with 1 Betta.
The rule is 1 inch per gallon. So if a fish is 2 inches then it gets 2 gallons, and so on. Also know that goldfish are extremely dirty fish and for a small 5 gallon tank it would be best to have only 1 or 2.
They cost around $10-20 depending where you buy them and what features they have. I would recommend buying a bigger fish tank like a 10 Gallon. They are very cheap, about $10.00 maybe $12.00. A 10 Gallon will do better and make the fish happier. The only reason to get a smaller tank is if you don't have very much space. You and your fish will be happier with a 10 Gal though. Your fish will grow larger, be more healthy and live longer. The rule of thumb is 1 Gal for each inch of fish you have.
It is classed as a very small tank and could only house about 5 inches of fish. (1 goldfish is a 10 inch fish)
Most Aquarist use this rule of thumb to put fish in an aquarium, 5 inches of adult fish for every gallon of water in the tank. The five inches only takes in the head and body. Do not use the tail in the measurement.