It certainly is a learning curve when you get taken by surprise, we have had a few members go on to raise some of their fry so hope you get there at the end of all this hard work

A photo would help us possibly identify your fish

Hi Sadie, Looks like a comet goldfish and a good size too as for tank size the bigger the better with plenty of room to swim up and down so would recommend at least 4ft long if possible, single tails are best kept in ponds really due to their potential size with company so you could always get him a rescue friend

Hi Jess, any update on your fry, how are you getting on, as Fishlady mentioned it may not be practical to keep all of the baby fish if they survive as you would need a huge tank, but hope you manage to get a few at the end of this experience. There are a lot of Coldwater care sheets and articles on here written by moderators and members who have had experience with large goldfish that you might find interesting so would recommend some reading, let us know how you get on

Hi Jess and welcome to FK, you are lucky you managed to save the eggs as goldfish are well known for eating them so well done, as for treating the water you will still need to use a water conditioner when doing water changes but would leave off using any algae treatments for the time being.
you can feed your goldfish infusoria and newly hatched brine shrimp, foods you can either buy online or culture yourself. usually after their first week of feeding, baby goldfish will accept dried fish foods like ground down flakes, although you say they are already taking this..
knowing your tank set up will help us too.

here's an old thread you might find interesting
https://www.fishkeeping.co.uk/modules/ ... t&topic_id=26720&forum=30

Just watched them and lovely set up but a lot of time and work for a small tank, need plenty of patience, have fun if you do set one up :)

Merry Christmas all xx

Hello Colosseo and welcome to fk sadly a lot of fish shop staff are not in the know when it comes to fishless cycling a tank, or they are told what to advise, and a lot are old school where you use fish to cycle it and end up like yourself with dead fish Cardinal tetras are quite sensitive at the best of times so not good for a un-cycled tank
To answer your question, you can start to add the Ammonia straight away we do have information on this method so will find it for you another method is using filter media from a mature tanks filter not the water, so do you know anyone local that has a mature fish tank set up at all

here you go

http://www.fishkeeping.co.uk/articles ... hless-cycling-article.htm

Hi Kingkong Sorry you haven't had a reply before now, how have you got on did you figure it out at all not familiar with your filter but on my Rena XP externals the outlet is on the left and inlet on the right, the filters usually have a diagram on it to show which is which

Wish there had been a different outcome as its not an easy decision to have to make but you did the best you could for Sandy, condolences