Many thanks for your feedback on your experiences with the biOrb aquariums, I am sorry to hear it didn’t quite meet your expectations.
The technical designers and customer support team supervisor at Reef One all have experience with fish, some having worked previously in aquatic stores etc., and do not wish to cause problems for ‘tank mates’. We recommend keeping between 3-4 goldfish in the 30L, and 4-8 in the 60L. I personally have found that our goldfish seem very happy and healthy in the biOrb aquariums.
The biOrb doesn’t scratch if treated carefully, and this is stressed in our information starter pack. As long as the media is placed in carefully, and the tank isn’t handled roughly or moved when full then it shouldn’t crack.
The filtration sponge only needs a quick swap over and partial water change once a month, this is quite good compared to some other filtration systems, and it is much more simple than it is made to sound on the link below. We do recommend washing the media etc before it is placed into the tank but it doesn’t need to be cleaned again afterwards, so therefore all a filter change entails is swapping the filter cartridge over and changing one third of the water – no ‘messy stuff’ involving removing the fish and cleaning the media again as mentioned in the link.
Once again thanks for your email,
Regards
Reef One