Except that lizard cats are omnivores. They eat both plants and meats. So don't expect him to be a algae control, he will need frozen foods, shrimp pellets etch as well.
Well the same goes for most catfish species, even the pleco species. Algae eaters would be Nerite snails, Ottos, Amano shrimp and so on, Bn plecos do a little work.
If this is your heavily over stocked 60l then you'll have to wait. The cardinals and 1 DG stock it alone. Whiptails need a bigger tank then that, as do harlys and if you have plans on keeping the 2 DG alive you'll want to separate them or move them into a 45+ gal tank.
yeah but even in the 100litre it would still only be big enough for 1 school, 1 DG and the whiptail and a few shrimps or snails.