I have 4 - 4" (10cm) Clowns now in 75 gallon looking to add 4 more. Wanted to add 5 Dario and hopefully 5 YoYos later on.
LFS will have Clowns and Dario this weekend.
My Clowns are the primary residents, but I also love the Darios and hope they can go well together? Also - or - YoYos if they can fit in or substitute?
Other inhabitants:
4 Australian Rainbows
1 Red Tail Shark 2.5"
1 Sailfin Synodontis Cat 5"
1 Spotted (Clown) Synodontis Cat 4"
1 Common Pleco 2.5"
Filtration:
Emperor 400 Bio-Wheel hob Powerfilter
Marineland C-220 Canister Filter
Penguin 550 Powerhead w/sponge
Whisper 100 Air Pump w/airstones
Gravel Bottom
Real Rocks
Fake Plants and Driftwood (Not open for commentary

Any compatibility advice would be most appreciated.
Thanks,
Keith