no problem-o
the pygmy corys are bottom dwellers and like to school together.
for the rummy nose tetra they like to school together in a group. people say that its good to have them in a school of 6, but then again it all depends on how big the tank is. and they grow around 2 inches
now i go by this rule for how many fish i can have per tank. so when you go and buy a fish on the description tag it will say its adult size and that is not including the fins of the fish. so the rule is if you have a fish that will grow to 3 inches then you will have 3 gallons of water in the tank used up by the fish. i find that this method helps stop from over crowding.
so if you have 9 fish and they all grow to 3 inches lets say then you do
9 x 3 = 27
then the minim space you must have for these fish to live in is 27 gallons or roughly 102 liters of water. now this is the water... so if you have a bunch of decor in it then that is taking the space away form the fish.. so if you don't go crazy on decor and by the looks of your tank you didn't then the fish have enough room to swim and be happy.
now you have a 60liter tank that is roughly 15 gallons.
so you can have 15 one inch fish lol
and for the rummy fish you were looking into you would want some but i'm guessing you don't want a tank that is just for them. so is they grow to 2 inches then i would say get three of them then you only used up 9 gallons of your 15 gallon tank... so then you have about 6 gallons left.
there are these type of some tetras
Glowlight Tetra size: 2 inches
Lamp Eye Tetra Size: 3 inches
Orange Von Rio Flame Tetra size: 2 inches
Black Phantom Tetra size: 2 inches
Red Minor Tetra Size: 2 inches (I've had these and i found that the showy ones with the large fins are aggressive towards my fish. didn't get them again)
Jumbo Neon Tetra size: 2 inches (or you can get the regular ones and they grow only 1 inch)
Rasbora Heteromorpha Danio size: 2inches
White Cloud size: 1.5 inches
Bloodfin Tetra size: 2 inches
Bleeding Heart Tetra size: 3 inches
these fish like to have plants that grow to the top. like a Green Cabomba Plant... these are very hardy plants and grow like crazy! i have them..
for an algae eater i would go with a Otocinclus these little guys are super cool to watch and will eat algae without up rooting any of your plants. and they grow to about 2 inches.
in my 20 gallon tank i have 2 of them and a bunch of angel fish... for these guys i don't count gallons for them. how i go with these guys is every 10 gallons put one in because then there is enough algae for them to eat and not to starve. so for your tank i would say one would do. but then again it all depends on how your algae is doing in your tank.
angel fish are very nice, but then again when they are adults they need a 20+ gallon.. and their size all depends on their breed.
i find this another cool fish is an African butterfly fish. they stay near the top of the water and need floating plants. they are very fun to feed, but will need a tank lid because they will jump out of the tank.
you can also get gourami fish,
there are powder blue and they are very nice, don't usually attack anything and will grow to 2 inches.
and there is a dwarf gourami that will grow to 2 inches as well.. but with these guys the males are super aggressive. I've had a male and boom killed 2 of my powder blue fish... didn't stay too long in my tank.
hope this helps. let me know if you have anymore questions