I've been thinking about keeping fish for a while now and i mentioned this to a friend of mine who told me that she had a tank i could have. Now heres the problem, her new boyfriend cleaned the tank (it had goldfish in) by putting the fish in a tupperware container, then emptied the tank and cleaned it with cillit bang, refilled the tank then put the fish back in. I dont need to tell you what happened. Since then he has cleaned it with fairy liquid. It is an 85ltr 30 " tank and is solid (i've leak tested it). I have read a lot about chemicals causing problems long term so i was wondering is the tank redeemable or shall i write it off, sorry if this sounds naive but i am a noob. cheers