i have two fantailed goldfish in a 60 litre tank and i get some
brownish material on the glass,i found a site that told me to clean
only the front of the tank as this is good for the fish (and the tank)
is this true?.i was going to get a cleaner fish but wondered if they
would survive in the cooler temps that the goldfish live in or if
feeders are only for tropical aquariums,also would it be possible to
raise the temp in the tank for a feeder and not harm the fantail`s,at
the moment i have a heater in the tank but its turned off as the two
fish seemed happy at room temp in the small tank i had them in before.


hope you can help

calvan