Seriously, those fish are taking over and I'm loving it. I only had one small tank a few months ago. In recent months I have been reading and learning, and I am now cycling tank 5 and tank 6 and thinking about tank 7. I need help 
Thankfully DH is very supportive, so is DS who knows all fish by name, and he hasn't even realized that I have sneaked out many toys to make room for the tanks.
Current set-up:
Tank 1 - the chaos tank (living room):
142 litres
sand substrate, coconuts, bogwood, live plants
big community of platies, guppies, corys and minnows
some shrimps and snails
It's called the chaos tank because those fishies in there are maaaad! Constant movement.
Tank 2 - the retirement tank (living room):
120 litres
fine black gravel, black background, purple slate, purple live plants
two ram pairs - two of them blue rams, the other two golden rams - who are called Bernard and Rose and Graeme and Pearl (the old couples, see?)
eight pygmy cories - their 'grandchildren' who are visiting and playing around
Tank 3 - the original tank (DS' room):
55 litres
sand, live plants, a skull (DS chose it...)
shrimps (two preggers at the moment) and eight neon tetras
Tank 4 - the posh tank (kitchen):
40 litres
fine black gravel, black background, bamboo hut, bamboo bridge, live plants
one male betta and nine harlequins
Very stylish tank (think fluval chi) that was my birthday present
Tank 5 - the cute tank (kitchen):
25 litres
playsand, brown glossed back
This is cycling, I am planning on adding one dwarf puffer. Decoration possibly coconuts or similar
Tank 6 - the kindergarten (our bedroom):
60 litres
After cycling this will be a fry tank as we are getting overrun with fry in tank 1. I might make this a bit of a fun tank, build huts with lego or so.
My local fish dealer has agreed to take them off me 50 pence to £1 per fish and I can accumulate credit with him, which means that I can always get testing kits / food etc in exchange for a few fry.
Tank 7 - the dream (kitchen):
Starting to read up on marine and once I have a new job in September I will make this dream come true.
Soooo, who is next? Confession time 