Platy Behavioural Issues & Bullying

Vlowman

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Hi all,

I've got a couple of things going on that I could use your advice on.

Context: I've got a 125 litre / 29 gallon planted tank that has been established for a couple of months (before that I had a smaller tank that some of my fish were in and which is still running upstairs) and seems to have no issues with water parameters. I did a fishless cycle and since then have been slowly adding fish to it - starting with those I already had, and adding one or two more every few weeks. I now have 6 zebra danios, and 6 male platys (to prevent breeding). This is them, in order of how long I've had them (excuse the Toy Story naming convention - this was supposed to be my daughter's hobby!):

1) Woody - a small red-gold hifin (original)
2) Buzz - a medium sized red-gold (second round addition)
2) Rex - a medium sized red wagtail (second round addition)
3) Mr Potato Head - a large red-gold (third round)
4) Slinky - a very small dwarf red (forth round)
5) Hamm - a large red (forth round)

After the initial set up, all subsequent additions had a couple of weeks (not quite long enough, I know) of quarantine in the original tank, before being added to the larger tank. Here are the problems:

Problem 1 - Woody

Woody spent most of his time hiding under the water sprite, clamping fairly often. A week and a half ago, I noticed a hold in his side (not head) and a red mark near it, so put him in the smaller tank and medicated for bacterial infection. He has healed up very well but is still the most timid (dare I say very boring) fish imaginable. I'm not sure what to do with him as I don't really want to keep a second tank running just for one fish who spends the whole time hiding - even if just to keep a cycled quarantine tank going.

I had thought that I'd keep the second tank running for a while - perhaps initially to quarantine 3 guppies, which I thought would be my final additions to the main tank (though I'm now wondering, as per the below, whether adding more is such a good idea), and after than I'm not sure - either a betta or just

Problem 2 - Mr Potato Head (and gang?)

The more worrying problem is that I've spotted what looks like bullying going on in the main tank. Mr Potato-Head, who is by a hair the largest fish, has taken to relentless chasing Hamm, the second largest. He doesn't really appear to 'attack' per-se, but he hardly gives him a minute's peace. When he isn't being chased, Hamm quite often surfs up and down the glass on one side - so I think he's quite stressed. I also think I see signs of Buzz and Rex occasionally joining in - though Buzz is also hiding a bit himself (though I've not seen him be chased).

I'm not sure why this is happening - is it as simple as Hamm got added and he's nearly as big as Mr Potato Head who thus feels threatened?

Anyway, I've watched and read all the advice on this. I can't 'redecorate' the tank as there isn't really anything to move around beyond all the plants - and I'm not uprooting them. I'm toying with these ideas:

a) feeding twice a day (smaller portions) instead of once. Full belly, happier fish, less bullying?

b) getting a breeding net box and putting the bully, Mr Potato-Head, in there for a few days (though just about everyone says this sort of time-out doesn't work)

c) moving Mr Potato-Head into the smaller tank semi-permanently and moving Woody back into the main tank and if that didn't work and Buzz and Rex took up the bullying baton.....

d) switching Mr Potato-Head and Hamm around so that it was poor old Hamm who was the only fish in my smaller tank

Thank you in advance for your help. Having dealt with various issues within these first few months, I'm finding it quite dispiriting that there's always something else to have to deal with - particular something of this nature that might require extra tanks to be used in ways I hadn't really wanted to.
 
The thing that I immediately consider is the hierarchy......the behaviour could well be basic top dog fighting rather than bullying per se

Having several males in a relatively smallish area often brings some bullish "I'm better than you" behaviour.

In regard to your aquarium layout and aquascape, could you post a photo of the entire aquarium please since there could be issues with a lack of sight line blocking...sight line blocking won't cure the issue but would certainly lessen it significantly
 
Thanks for your reply @wasmewasntit .

I'd be relieved if it was something to do with establishing a hierarchy - which I assume would come to an end eventually, no?

This is my tank - it has a row of bacopa, amazon swords and water sprite along the back. Some anubias and java fern in mid-row, and some slowly-getting there crypts at the front. It generally feels a bit more full of plants than it looks here somehow:

IMG_0442.jpg
 
Thank you for the photo

Once the plants are more established they will offer more sanctuary for those who are lower down the pecking order. It does sound like its more a case of hierarchy sorting. The fish have not been in the aquarium that long, the plants are not as bushy as they eventually will be so hiding spots where fish can just sit and chill out or keep out of the way are a bit thin currently

The resin rock hide in the center is a good place for one to hide out of the way, if you could add a couple more of those or rocks (real or artificial) within the planted areas that might help give the fish places of sanctuary & security, thus allowing them to be able to escape from direct view of their perceived problem neighbour

Hierarchy can take a while to settle down...but it will settle. Having the extra hiding places will certainly help stop the obvious behaviour tween the fish, you'll not get rid of it completely as there will always be days when the aquarium boss has a bad day and picks on everything that moves, but with the extra hiding spots, the rest of the fish will have somewhere to run to if need be.
 
Hierarchy can take a while to settle down...but it will settle. Having the extra hiding places will certainly help stop the obvious behaviour tween the fish, you'll not get rid of it completely as there will always be days when the aquarium boss has a bad day and picks on everything that moves, but with the extra hiding spots, the rest of the fish will have somewhere to run to if need be.

Thanks for this. I guess I won't jump the gun and move anyone out of it just yet then, and I'll think about adding an extra artificial hiding spot or two while the plants continue to grow.

Long term, do you think adding three guppies into the mix would be largely ok - in terms of this particular issue? In pure stocking numbers and filtration capacity I think I'd be ok.
 
Guppies should be fine but I would wait til the plants are more established and your hiding spots have been increased to allow the Platies to calm down and get their pecking order sorted out first
 

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