Right okay it sounds like you are now in a position to sort this tank out now with the platies in the tank. Prior to this you had a really bad mix of fish, fancy goldfish need very big tanks and common goldfish need to be in ponds really. You also mixed tropical fish and coldwater fish which again is a big no no, the numbers of fish you had were really bad as well there were far to many. And again you had some fish that would vastly outgrow the tank like the ghost knife fish which has a max size of 18 inches same with the clown loach, even the smaller large fish like the red tailed shark which gets to 6 inches is too big.
Right so an 18 inch cube is 25 gallons so thats how we determine the amount of fish you can have and to what size you should go with the fish. All fish will grow to their adult size no matter the type of fish you have, even goldfish.
So with 6 platies and 2 fry you are quite lightly stocked now, after 3 months I would expect your filter to be cycled and with a good amount of bacteria in there now which is good.
With the unidentified floating object - I would post an article in the tropical emergencies section and try to get a pic of them if you can so we can work out what to do.
Once these are sorted you can start to add fish but you have to research how big they grow and if they have the same needs as the fish you have now. So you have tropical fish now so avoid goldfish and read about fish before you buy them so you dont get large growing ones like the black ghost knife fish.
Wills
Right so an 18 inch cube is 25 gallons so thats how we determine the amount of fish you can have and to what size you should go with the fish. All fish will grow to their adult size no matter the type of fish you have, even goldfish.
So with 6 platies and 2 fry you are quite lightly stocked now, after 3 months I would expect your filter to be cycled and with a good amount of bacteria in there now which is good.
With the unidentified floating object - I would post an article in the tropical emergencies section and try to get a pic of them if you can so we can work out what to do.
Once these are sorted you can start to add fish but you have to research how big they grow and if they have the same needs as the fish you have now. So you have tropical fish now so avoid goldfish and read about fish before you buy them so you dont get large growing ones like the black ghost knife fish.
Wills