Hi.
Just thought i should give my advice
TANK 1 -(60L)
1 Pleco- remove it will get too big, also too messy.
1 Sucking Loach- will get big (you know that)
1 Black Lytail Mollie- fine
1 White Mollie-fine
1 Platy-fine,but needs friends
2 Female Guppies (Male died gotta get another when next go Hollybush)-you will have even more guppies!
2 Clown Loach- too big
2 Silver Sharks- way too big
4 Zebra Danio- fine
8 Neon Tetra- fine
Tank 2 - 50l
1 Pleco- way too big in the future, too messy!
2 Gouramis- fine
4 Tiger Barbs- need 2 more to stop fin biting but your tank is too small
4 Zebra Danio -fine
Hope that helps!
~betta_246