I love L128s. I have 5 juvies with plans to breed them when they get bigger. I had 1 in my 75g but he was less than 3" and didn't grow much. I found a lfs that had a ton of L128s in the 3" range and bought 4. I had them in a 10g QT for about 2 months but I did 50% water changes almost every day and they're almost 4" now. They're all in a 40b with a few other plecos. I also have 3 4" BN plecos, 2" rubberlip and 3" L201 snowball in other tanks.
In the 40b are 5 L128s, 3 L333, L204, L387, L007 and Super Red BN. I also have 4 Goyder river rainbow juvies (>1") and 7 guppy fry.
I got a L007 specifically for my 75g. He's 4.5" now. The 3 L333 are under 2". The L204 is about 3", not including trailers. L387 is about 3" and SR BN is under 2".
They poop a ton so I vac almost every day so the tank gets at least a 10% change 5-6 times per week with a weekly 50% w/c. The AC50 on the right is mainly for bio filtering and the Topfin MF10 on the left is for flow.
10g QT with 5 sterbai cories (they're breeding now)