Fish All Swimming At Surface, Help!

frog_girl

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Hi, I really hope someone can help and fast replies would be appreciated.

We have a 64 litre tank, with live plants, 6 male guppies, 1 assassin snail and then yesterday we added 4 female platys. The ammonia/nitrite levels have been good I believe for a cycling tank(ammonia 0 nitrite below 1.25). Anyway:
we got the guppies about 2 weeks after we started the tank, and they've been doing really well. A bit of what seems to be bickering, but they seemed healthy. About 5 days ago we decided that they might have fin rot (slight transparent line at the end of some of their tails), so bought Interpret treatment no.8 and added as per instructions.
About 2 days ago we noticed that the guppies were hanging around the top of the tank, so upped the filter pump speed some (though trying not to go too crazy cos apparently hard pump rates are bad for fancy guppy tails). Then yesterday we added our 4 girl platys. They're actually getting on surprisingly well (a small amount of chasing of one of the girls but she seems to get breaks).

This morning my bf did a 50% water change (grubby water, presumably from poopy scared new platys and also from the brine shrimp treat the guppies had that morning), and refilled, then did another 25% due to it still being really cloudy. I took water to pets @ home this evening and it's reading ok for ammonia and nitrites. HOWEVER they're now ALL at the top of the tank and I'm really starting to fret.

We have a new 25 litre tank that's been set up since yesterday, and has 2 disposable live plants and a little of the current aquarium tap water in (and filter start). I don't know what to do. I'm really fond of some of the guppies and will be so upset if they die (and also obviously upset if the others do too).

So what do I do? Let it settle? The filter pump is bubbling in water quite fast. They do pootle down to the bottom of the tank but primarily they're up the top. The tank glass has developed what I understand to be a thin layer of algae for the first time. I'm just freaked out and I don't know what to do to help :( Should we risk moving some of the guppies to the new tank? And which are more likely to survive, the ones who stay or who move? Help please... :(

PS: I know we need more girls and we'll do that, just so long as we stop them suffocating first :( pH is 8.5, temp. is 26oC.
 
READ THE ADVICE ON FISH IN CYCLE IN FIRST TANK SECTION
Fish-in cycles are tricky and adding so many platies at once has upset the cycle. Keep up the water changes every day. Also increase aeration by adding an airstone and pump or , quicker and cheaper, move your intwrnal filter to the surface so th eoutlet creates surface bubbles. Moving fish to a new uncycled tank won't help much though if the big tank is overstocked moving siome guppies to the smaller tank may help. Whatever you do, keep up with the water changes daily AND make sure you add dechlorinaor to tap water. If you don't have enough, store tap water for 48hours before use in bucket to remove the chlorine.
 
Added to many fish to soon.

Water changes, and increase aeration.

Main cause of finrot is bad water quality.

Brown algae is common in a newly set up tanks. Just scrape it off.
it will disappear once the tank matures.

Read up on the nitrogen cycle.
You will find pinned topics in the new to the hobby part of the forum.
 

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