Changing To Smaller Fish Tank

[fish_4_life]

Hi all,
 
Due to moving into a small flat next week I am having to down grade to a lot smaller tank. I currently have a 3 and half foot tank and have bought a small 28 litre pets at home aqua start 320 if anyone is familiar with the name I have to make the hard decision of which fish to keep this is where I wanted some advice I was planning on keeping my 2 harliquins, 2 female guppies that were hand raised and my 3 glass catfish. I wanted to know if that is going to be too much fish for a 28 litre tank? Also I am planning on somehow connecting my external filter up to the tank would this be over kill even if I turn the power on it low, otherwise I will use the little crappy internal filter it has come with.
 
Many Thanks in advance 
 
Dan

 

[AshleyNZ]

Harlequins need schools of 6+ and are too large for that tank, also the glass catfish

 

[bassdawg]

I have a 40 gal breeder an love it , not to big or to small .

 

[Lillefishy]

A 28litre is only really big enough for the two guppies, but if they're pregnant it'll soon be overstocked.