Now, if I were to have a brand new 135 to stock, I think I would start with setting up an end to end current, burying the manifold in fine, smooth gravel, distribute around a bunch of river jacks and driftwood, liberally greened with Java Fern, and some Hygrophilia angustifolia at the downstream end with the stems protected from rooting fish by the aforementioned river jacks. Maybe some potted swords along the back of the tank. Into this I would put 8 to 10 clown Loaches, 3 Bristlenosed plecos, 3 SAEs and about a dozen Bengal Danios.
HOWEVER, if I were going to put any angelfish in there, particularly veil tails, I would avoid clown loaches. They get a little bit nippy. In fact, I would avoid any loaches but B. striata, B. kubotai, and P. kuhli (or maybe other Pangio species). It has been my experience that all but the most peaceful botiine loaches (Even sidthimunkis) nip, not out of aggression but curiosity and playfulness. They'd put a quick hurtin' on a veil tailed angel.
Come to think of it, if I had to have veil tailed angels in the tank, I would lose the Festivums too, and limit my color cichlids to Laetacara spp. That being the case, 8 Angels, 4 to 6 Laetacara curviceps, Bump it to 30 rummies and 20 lemons, add a tight lid and a school of a dozen silver hatchets (get the pure silver ones - the ones with the line are actually river hatchets, and they get a bit bigger.) Then the Loaches, Cories, and algae eaters as described.
Alternately, go with a really sparse planting schema - Sand substrate, sword plants in clay pots with the roots covered by river rocks. Lots of driftwood, though, particularly the branchy kind (manzanita if available). To that, add 8 Angels, 20 Hatchets, 3 Whiptail Catfish, and Eartheaters of one sort or another (Probably Geophagous steindecheri or Satanoperca daemon or S. jurupari, but there are a ton of them out there) 6 to 12 depending on the size of the available species. This is all about making the sides and ends full of really branchy, tangly driftwood for the angels to hide in, the swords for them to center their territories on, and a big expanse of rock studded sand for the Eartheaters to plow. Oh, and I'd probably put some Brazillian pennywort, just floating, to give the Hatchets some overhead security.