Help With Stocking New Tank

As my tank is now cycled I need to think about adding more fish in batches. I wanted to seek your expert input so I can get the right/amount fish to my tank. I have 54 liters, 60x30x30 cm tank with an internal filter and gravel substrate. I have both live and artificial plants. I am living in hard water area and my GH is between 8 to 15 dH and PH on average 8.4.

At the moment I have 4 male guppies in the tank. I am looking for:
4 male platies
2 to 4 honey gouramies (either male or female but not mixed)
I am also interested in the below fish; not limited - but not in large groups
mollies
female betta
Otocinclus
Corydoras
Hillstream loach

Any good suggestions?

Thanks Sue, Indeed my list gets destroyed! That's why I am here for advise.

How about Panda Cory - I believe they thrive in very hard water and a single male Dwarf Gourami?

The site profile also says Otocinclus can live in VH water.

I really need Platies so cannot choose CPDs.

Don't get dwarf gouramis unless they have been bred locally. Virtually all dwarf gouramis in shops were bred in the far east and they are known to be infected with dwarf gourami iridovirus and some sources also say they are infected with tuberculosis. The iridovirus is incurable and results in the death of the gourami a few months after purchase.

Panda cories are OK up to hardness 12 degrees. Can you pin down your hardness as 8 to 15 degrees is a large range. Have you looked on your water company's website? if you can find it, make a note of the unit as well as the number. Panda cories need a group of at least 6 with 10 being better.
Otocinclus are OK up to 10 deg hardness. However, they should not be added to a new tank; they need to wait till the tank has been running at least 6 months and has algae growing. Some individuals will never eat any other kind of food and without algae they can starve.
Otos commonly just die shortly after purchase. This is because they are not fed properly between capture and the shop. They have bacteria in their intestines which help them digest their food, and if they starve too long these bacteria die. then no matter how well fed they are, they cannot digest the food without the bacteria. When buying otos, wait until they've been in the shop at least 2 weeks so that the weak ones will already have died when you buy them. Choose the specimens with nice rounded tummies. You'll need at least 6 as they are shoaling fish.



Personally I like both shrimps and snails, though I do appreciate they are not everyone's cup of tea 

The hardness is expressed as mg/l calcium carbonate. Those doesn't mean that it includes KH. My son used to work for a water testing company and he explained what hardness means.
Hardness is the amount of divalent metal ions. In practice this means mostly calcium, some magnesium and trace amounts of other metals. But they can't give a number with the unit being "mg/l calcium plus mg/l magnesium plus mg/l x plus mg/l y " so they give the number as what it would be if all the metal ions were calcium. They call this mg/l Ca (my water company uses this unit). But they also have a unit mg/l calcium carbonate which means this is what it would be if it was all calcium carbonate, and this is the unit your water company uses.

So after all that waffle, the number you need is 350 mg/l calcium carbonate. This unit is the same as ppm, so your hardness is 350 ppm which converts to 19.6 deg (or dH) - these are the two units used in fish keeping. This is very hard water, too hard for cories and otos, I'm afraid.

We do have other members with very hard water who will be able to help you - @Littlefish is one.

The entry in the table says "Hardness (total)" which means GH. If they had an entry for KH it would be called alkalinity. UK water companies rarely give KH.
Hardness and KH (alkalinity) are measured by different test. Hardness cannot include KH in a water company's tables.


GH - they measure the total amount of divalent metal ions, and call this total hardness.
KH - they measure how much acid it takes to lower the pH to 4.5, and call this alkalinity.



GH is what used to be called permanent hardness, KH is what used to be called temporary hardness as it can be destroyed by heating.





Amazing what we can learn from our children 

I forgot to ask - is there an upper limit for GH in your tester? If there is, it will show that highest level no matter how high the reading really is.

I forgot to ask - is there an upper limit for GH in your tester? If there is, it will show that highest level no matter how high the reading really is.

Highest goes to 16dH but I use Tetra mobile app to read the readings for me so it tells the exact number.

I will have a look through some information that I have, to see if I can find some small fish that will be suitable for both your tank size and your water.
 

How about a small group of endlers  https://www.thinkfish.co.uk/fish/endlers-livebearer.html

Or even a few x-ray tetras https://www.thinkfish.co.uk/fish/x-ray-tetra.html  which should be ok up to 20dH.

X rays are not on the known fin nipper list