I dont know what is wrong! *more mollies have died

What a nightmare!
have you many left in tank?
when you changed the filter did you use any 'old' filter media? How big a water change did you do?
anything new added to tank at same time? new ornaments etc.?
any meds used? any sign of problems with your heater?

juveniles will find it much harder to adjust to big changes in their environment compared to adults.

After running for 3 months your tank should have had a well established filter.
Cloudiness at this stage is usually caused by overfeeding, insufficient filtration, or algae growth.

Changing the filter and a big water change can affect the water balance, expecially if the cloudiness was caused by overfeeding/too small a filter and or not enough debris removal.

Over time the fish waste, uneaten food and dead leaves from plants can slowly alter the chemistry of the water. Because the fish live in the water, and the changes happen slowly, they adjust to it.

Suddenly making a big shift in water quality can shock the fish in this type of case, their immune system is usually lower due to conditions they've got used to and all of a sudden the whole water balance is altered it can be enough to kill them.

Definately see if you can figure the cause of the problem and those test kits will be especially important with the new filter

I so hope you don't lose any more and find out the cause hun, that must have been really awful to come down to this morning

Right, *SIGH*
I have 7 adults and about 20 babies left.

When i changed my filter the old/new one had only been in there a week only changed it as it was sucking up my fish! So no old media went into the newer filter.

I only did about a quarter of the tank so 25%

Nothing put in when i changed water but the week before i added some mini water lettuce.

No meds used just put some tap safe in as usual no problems before with it.

No problems with heater either.

I think i may have been guilty of over feeding as id give flakes in a morning, then afternoons sometimes id give the fish treat tablet and then feed again before bed (about 12.30ish) I think i do it as i dont know if all the little ones are getting something to eat!

Iv just used the little water testing kit, looks like something ud use in Chemistry at school!
The results are:
*NitrAte - 5.0
*NitrIte - 1.0
*Ammonia - 0.25
*PH - 6.6

What should my results be if they arent quite right and if they are wrong what do i do to change these??

Thats where the problem has been then hun, filters have been going through the nitrogen cycle which also explains the cloudiness.... water so rich with food etc that the filter wasn't clearing causing an algae or bacterial bloom.

nitrates aren't so harmful and should be under 20ppm
nitrite should be at 0ppm
ammonia should also be at 0ppm

I would buy some safestart or similar.. it contains some of the healthy bacteria or enzymes that helps kickstart the process

Dose it as per instructions, with frequent small water changes. For the next few weeks/month or so you need to treat your tank as if it has no filter at all

Check your stats regular until it settles to the proper range of zero nitrites and ammonia, then tank should be ok on a weekly maintenance schedule.

And definately reduce the feeding.. even crumble the flakes smaller so the bigger fish take longer to eat as they have to take more mouthfuls, plus smaller bits will make it easier for the lil ones to get easy swallowed bits and can eat more before the adults finish the lot.

Thank you so very much, when you say small water changes is a 25% ok or should i do less than that.
Also do i but the safestart in the tank while the fish are still in there or do i need to take them out?
Im glad i at least know whats wrong and how to treat it now.

In a perfect world you'd want to fully cycle your tank without fish and using liquid ammonia but i'm sure thats not possible

25% would be great but a bit less than that if done regular will still all help

90ltr tank you'd be wanting to change between 10-20 ltrs approx every two days while the cycle is happening and be quick with the siphon for left over food as it will all add to the problem.

safe start is used while fish are in tank and won't harm them in any way, hopefully it will speed up the process.

Thanks again now i know what i need to do il update in a couple of weeks to let you know how im going with it.

I personally would put another filter in there aswell. i have just put a 3 plus in my 65L and i wouldnt want to put it in a much bigger tank. it only does 700lph and i aim for a 10X turn over so i personally woulnt use it in anythink over a 70l. If i where you i would add another filters that does 300 lph to give you 1000lph which is just over 10X turnover and having 2 filters at difrent ends of the tank should hel with water movment

Thanks Kiz but im afraid things have gone bad to worse the mollies are dropping like flies...they are fine swimming about then suddenly dropping to the bottom of the tank lifeless.
Its really getting me down and with the tank being in my livingroom i just keep looking at it!
Cant bare seeing the fish die anymore iv turned their light off until the morning. So fed up

I would do a massive water change. I get it might be a little upsetting but dont just leave the dead ones or they will break down in the water making more ammonia.

I did a 50% water change on sunday and thats probably what upset them, so not going to do another yet, also iv been fishing dead fish out all day! Not left them in there thats
Fished 17 out this morning and a few this afternoon and 4 before. Il check before bed if i need to fish anymore out.

I would still do another if theres still ammonia. Sorry to hear about all the fry dieing. What was your stocking?

I did tests today the results are further up the page. They are mainly mollies in the tank, but i do have neons and corys who havent died from whatever it is killing the mollies

I'm sorry for what your going thru that would be so devastating.

I hope things are better today!

@oceanmaria - thank you, at least 25 babies died yesterday only 4 what i could see that i fished out this morning
But iv noticed they are doing weird swimming things and bumping into things like they dont see them, some ate the flakes last night. Im finding it quite weird too that only the mollies are dying and not the corys or the neons.

Just fished all the dead mollies out about half an hour ago, taken the plants out and some of the ornaments in there. Left in the moss balls and the volcano. Iv just counted that there are only 7 mollies left out of about 30 babies and 9 adults. Not very happy at all.

That's terrible! I'm sorry you're having such terrible luck! I wish I could suggest something to try.

Down to 6 now, they are totally losing the will to live now and im getting depressed about it...i hate looking over to see if anymore have died
Going to move my corys and neons into a different tank as they havent been affected at all. Where as the mollies are bumping into things like they cant see them and sitting on the bottom, iv also noticed they'll stop and start wiggling really fast side to side!
Thanks for the hugs Taelin i need it right now, so fed up!

could it be a bacterial infection?

Thank you feeling a little better now
Its something to do with the filter i think, as its a new one and hasnt cycled and i didnt have any old media to put in this new filter as i was only replacing the other filter as it was sucking all my fish up (it was only 2 weeks old when i replaced it with present filter).
Also my nitrAtes are pretty high as you can see from the results above.
If everything dies in there im going to totally clean it all out, fill it and cycle then slowly add female bettas this time rather than normal community fish.