i worked in tropical fish shop and wholesalers in belfast 25years ago for a few yearsand had up to 11 fish tanks during that time plus a tropical pond and a couple of outdoor ponds.was out of fish mostly until 5 years agowhen i had to sort how to keep some of the larger south american cats etc (after remembering seeing an 18" marble sailfin cat laiarius pictus that someone brought into the shop 20 odd years ago).still haven,t been able to pick up one of these.main interest is larger catfish ,american cichlids and some of the bigger characins barbs oddballs.also designed and built several large tanks and filter systems .next tank project is a 12 foot river tank,with several small pools running into one deep pool with water being pumped around the back of the tank.