Thusly "LM" Spake Unto All:

I'll try to post a photo.

You'll find that difficult in this group.
However for comparison, these SAE's:
http://www.andras.net/images/siamese_algae_eater_6.jpg
http://www.aquabotanic.com/images/SAE2.gif
aren't fat.

recently SAE's been harassing eachother.. may be the tank is getting small
for them? hmm...

No, they often do that. SAE's are said to be peaceful and social, and
compared to chinese algae eaters they are, but it's still a truth with
considerable modification - quarrelling and chasing are normal
activities of SAE's. Some individuals can be *very* aggressive against
conspecifics. No harm will come of it, provided you have tight-fitting
lid (otherwise you'll start finding SAE's on the carpet, as they tend
to jump when chased).
If it gets annoying, with constant round-the-clock chasing, buying
more of them may help diffuse aggression.
Alternatively, if you have one of those excessively aggressive
individuals, removing it might not be a bad idea.