Thanks again
OK guys one piece of good news is the plecs are bristlenose plecs, and i have done google's on the various names and they say the max size is around 6" (12-15cm) but need about 29g

, I think i have two females, there are no bristles on their faces, and i've been told to only have one male in a tank as males are terratorial by my LFS.
(don't want any babies at this stage)
I have an Eheim 2007 filter and replace 10-15% water every friday while siphoning up the gravel. Don't have a water tester yet...
I do keep an keen eye on the fish (i sometimes watch them for 10 minutes at a time).
When I first set up the tank I got that infamous spot disease + fin rot, it has been treated and now I watch them like a hawk, for any odd behaviour/spots/missing fins. I have observed the following so far.
Platies - (3 Females, 2 males) Ultra active and always swimming everywhere, the greedy lot of the bunch, one dominant male chases the other male and female most of the time. Two Females to that bossy male, then one female and other male seem to be "loners" amongst the Platies. Althought the lone female becomes bossy when food around and chases all the other platies.
Plecs - Hide half the time and come out the other half, which is odd as i thought they only came out at night. So I do spot them on the windows sucking away on occasion and find it amusing everytime they are on thw side and i can see their mouth.
Neons - When the tank gets excited (i.e.) food gets dropped in, they zip about nipping the food, they don't seem to shoal like they did when first introduced to the tank. shoal once in a while though but hardly anymore.
Koolie Loach - The most "shy" of all. Come out when feeding time. On rare occasion they seem to swim up then down side of tank then along tank bottom then back to the one side and up and down and across again, and they seem to do this mostly together.
Angel fish - Well they seem to be the second most greedy of the lot. The minute you walk up to the tank they are in the front with the platies, doing that feed me act. They are slow swimmers though and are quite funny when trying to "catch" food they are the slow versions of the platies.
cichlids - have one with a purple tummy, the other has none, the purple tummy one seems to chase the other one on occasion, but they seem to keep to their own. The non purple tummy one seems to hide more than the other, and the purple one seems to have found all the holes and hidden itself here and there...
the only fin nipping i have observed is the fattest platy sometimes nips the fin on one of the angel fish, and it's always the same platy that nips the fin of the same angle fish... odd... now i hope i have not bored you with my observations... i will get another tank so i can seperate them somehow, i am considering getting another one the same size for now... and yes i know, i have too many...
(been edited - I have decided to get a 20gal tank, I found a new one on ebay with stand for £150 including filters and heaters) so that will defo help me out...