Young fish sometimes change colour as they grow. As long as it seems ok otherwise and is eating and swimming ok then I would try not to worry. Under-gravel filters (which is what you have by the sound of it) aren't ideal for goldfish because they produce a lot of waste (poo) which can clog the gravel if you don't clean it regularly. You'll need to use a syphon gravel cleaner on it quite often or switch to an internal filter such as a Fluval 1+.

For now, keep an eye on their behaviour and the way they swim and eat, if this is ok then the fish probably are too, and the colour change is just natural.

I had a look at some tanks. They've got some really nice ones and we are planning to get a new tank. Might get it from there if the prices are good then! I love looking at all of the fish (wishing they were all mine!)

I do add some plant fertiliser from time to time, but not tried this particular one, they seem to work a bit. di

Thanks everyone! I thought I'd ask as I am sure I read something about it somewhere, but it saves me a job moving them!

I tested the water recently and noticed the KH and pH of the tank water had fell below the lowest on the scale of the Tetra 5 in 1 strips - the pH is lower than 6.3 (i think)

The fish seem fine and it says on the instructions to correct this i can add marble chips to increase the KH which is a pH stabiliser

I have heard the local water supply pH alters frequently
Also, i saw some Tetra Easybalance in a local aquatic supplier which says it can reduce frequent water changes and stabilise KH and therefore pH levels

Does anyone use it? I am reluctant to change things when the fish are fine, just wondered if long term exposure to low pH can harm the Goldfish?

Anyone used this product? just saw it at weekend and wondered if it would benefit my plants
I only have weighted plants and a floating plant which seem to do ok at the moment-just wondered if they would grow better with a little help?

they will probably enjoy the party, they should be fine

Fish feel vibrations in the water through their 'Lateral Line', a line of nerve endings that runs down each side of the fish. You can see it if you look closely, it is a bit darker than the scales and usually runs from behind the gills, right down to the tail.

My fish used to get exposed to loud music quite a lot and never suffered. They used to disappear while it was on but didn't suffer any long term effects. I'm sure yours will be fine for a night. They might seem a bit jumpy while the music is playing but will soon be ok. If you're going to make it a regular thing then you may want to move the tank. Otherwise, try not to worry

They are very helpful too! and will test your water for free and advise you if it's not right
I am getting my new Juwel tank from there as it is £45 cheaper than anywhere else!

It is a bit difficult to find, but the display of tanks-in a kind of darkened room-with the tanks lit up is really cool

Glad you paid them a visit

Although fish don't have 'visible' ears, i have read they have very sensitive hearing and i would imagine they can feel vibrations through the water

I don't have a stereo in my room to play music with, but my fish love to watch t.v. at night!