Mollies And Platy Fish Staying At The Bottom Of My Tank

[jetnett]

Hello I'm new to this site my first topic.
I bought my first tank last may a 40 litre tank but soon got bored so last Thursday I bought a 150 litre tank.
I has been run with the fish I got with it and my old fish since the big water change since last Thursday and they seem really
happy. Today I went to the pet shop and bought 5 rummynose tetras 2 lyretail mollys and two large  golden sailfin mollys. all seemed good till about  1 hr ago when
. my 2 sail fin mollies have gone from the top of the tank to the bottom and is not moving form there. tetras are great swimming with my neon tetras now. so not worried about them but something seems strange in my tank as
even my platys are staying down with them and my clown loach is not moving away from them. the smaller mollies are staying slightly above them.
Been reading online and it all seems to be the case that they are dying when the stay at the bottom. my tank is clean and if it was something wrong with the water wouldn't my old fish and the fish that came with the tank be poorly too ?
Thank you jeanette

 

[Blondielovesfish]

Do their gills look like they're moving rapidly?

When in doubt, do a water change, see if that perks them up.

Do you have a test kit? If so, what are the readings for ammonia, nitrite and nitrate?

Also, I thought I would just make sure you're aware that your clown loach needs a bigger tank as it grows.

 

[jetnett]

its a 4 foot  tank I thought that was a good size for a loach ? I feel a bit better now as my mollies seems to be moving around a bit more now but I will head down to the pet shop
tomorrow to buy a test kit as from reading topics on here tonight it looks like it is what all fish keepers do.
Thank you jeanette

 

[Blondielovesfish]

Clown loaches are active fish and can reach over 1 foot long. A 300L tank is considered their minimum tank size though 380L is better.

 

[the_lock_man]

That was quite a large number of fish to add to the tank in one hit - sounds rather like the filter bacteria couldn't cope, and the fish were suffering a small ammonia spike. You will have to watch out for a consequent nitrite spike too. When you get your test kit (and yes, all decent fishkeepers have one, as indeed do I), make sure it's a liquid-based one. The paper strips aren't really accurate enough.

 

[jetnett]

Ok thank you will buy it today. All the fish are fine now though not sure why the pet shop allowed my to buy so many in one go
If it's a danger to the fish and tank to do so
How long should I leave it now till I can add some more fish ? The tank came with a german blue ram a female
She is such a nice fish active and friendly. Would like to add
A friend to her. I do have my betta in the tank tho but they get one fine but will maybe two cause trubble in the tank ?

 

[the_lock_man]

Just quickly reviewing, and I'm a little confused, could you list out everything you've got in your tank, please. You may well be at or over your maximum stock level.

 

[jetnett]

ok no problem the tank is 160 litre and in the tank there is one male betta one female german blue ram one clown loach
10 tetras 5 neon 5 rummynose  two corydoras catfish three female platy. two sailfin molly fish and two  small lyretail
 mollies