Hello! I wanted to thank you first for the site, there are many beautiful things and for those not expert help :) . I wanted to ask your advice, I have a Askoll of 170Lt with 4 goldfish (3 oranda and a black moor) is a few months that I have a problem with algae, invaded me, I cleanse and rebuild them ... is not exposed to direct light right, has a balcony that illuminates the side but not excessively (I think) and I can not even move : ( As a filter ... I have a Pratiko outside, I was given by aquarium. Beginning was good (they are 2 years and a half that we have l) but then it started giving me these problems: dirty water, etc. stuff that was floating. . now I have decided to change it and do it even also "look" of the aquarium. I've seen online but I do not know which filter to take, there is one that looks good evening fil bioactive 250 with uvc, says that thanks to the description uvc light counteracts the formation of algae .. but it costs a little bit and then ere I wanted to do this spending some advice .. you know any good filter for goldfish? Tips?
I want that white aquarium sand off and put a red or otherwise of this color, but real and some fake plants dried, the fish eat willingly :) Piabte true .. I did not precisely because with goldfish nn know if would last longer and do not have much time to care for .. you have some advice also sull'arredo? Now I've moved to another aquarium smaller and therefore should also make haste to rearrange the big ... I hope you can help me .. hello and thanks

Hello Claudio,
goldfish messy, it's true ... but it is always proportional to the food ... is not that they are 4 "calves Panzoni"? :-)
Do you think you not feed them? Use quality food ... or any one? Why are certainly not all the same ...
The laghe are formed depending on the values ​​of the water, but did not mention so I think you do not have bothered to measure it to fit the partial changes.
The Pratiko dell'Askoll is a great filter, so I would recommend you to rethink the overall maintenance of the aquarium filter, rather than buy a new one. You have a couple of books, such as a generic on freshwater aquariums and one specifically on goldfish? Also think also that, in 170 liters, you may keep other species of fish and not think they are all the more difficult or demanding than goldfish. :-)
Moreover, not having real plants, such as water oxygens? Do you have an aerator, I hope ... or coming to the delivery of external filter, or in summer the fish are likely bad.
With the Oranda is however difficult that some plants can stand, try to limit or Anubias Microsorium.
It still does not illuminate the tub too, otherwise the algae do not have competitors and enjoy themselves. :-)

  • clean the Pratiko, where there must be a sponge and / or wool and razor clams
  • keep a water exchange rate regime "generous", for example 20-30% at least every 15 days
  • fed the fish sparingly
  • keep the water oxygenated in some way

With these simple rules I think the situation will change drastically. ;-)