Newbie Looking For Advice

Evening all,

I havent kept fish for about 14 years but when i did I kept fish like angel fish, gouramis all the way through to piranha's (obviously not in the same tank) unfortunately when my children came my fish had to go, so 14 years later im keen to pick up from where i left off.
I have purchased a Fluval edge 23ltr tank just to start with, i have put sand in the bottom, added plants , applied appropriate chemicals before adding the water and then added some Guppies, job done. But im concerned they dont seem to be eating, ive seen a couple (out of 5) have a few nibbles from a few flakes but not what i was expecting and they don't seem to swim to the top of the tank to take the food which i always thought was the norm. I only put the fish in last Sunday so you do you think it could just be a bedding in period and i just need to give it time or should i be concerned ?

Any advice would be appreciated as im keen to get back into my childhood hooby.

 
Evening fcmf,

Thank you for the warm welcoming and also thank you for the advice. I see things have moved on a lot and im more than willing to read up and do what is necessary to get my fish healthy. Just one question though, what has changed so much over the years to make this such a complex science, all my fish wre fit and well when i kept them many years ago, maybe the harshness of water or is the chemicals that now goes into water ?

Welcome @Redbelly
Like you I returned to fish keeping after a 20 year break and realised the 'error of my ways' There wasn't the The Internet then, goldfish were in round bowls and were generally thought by the public to have had a long and happy life if they got to their first birthday
Back then I knew enough to put two I inherited in a 15 gallon tank running an undergravel filter after they had been in a bowl for a year and was very pleased to see them double in size after 6 months. I didn't have water test kits, just vacuumed and changed water straight from the tap. At some point I added a filter as they got bigger and then a second but again I didn't know not to wash the foam in tap water.
The poor little blighters survived another two years but died a week after we went on holiday and asked a neighbour to feed them. I of course I had done a huge water change and given both filters a good clean because they had been over fed. So I killed them not the neighbour, and they were probably surviving rather than thriving up until that point. Those fish of course should probably have still been with us if they had lived their natural span......
So nothing has changed in those years - they died of ammonia poisoning but I didn't know it and ignorance is bliss. I am now aware and 'worried' about water quality even with massive filtration, proper water changes and water tests test kits and I still lose the occasional fish so I'm still learning.
Oh and by the way - enjoying fish keeping more than before - I hope it works for you as well.