lasse method cuc

[NoahLikesFish]

would this be a good cuc for my 20 long, i already have a astrea, a turbo, and a cerith for snails and a blue leg and a tiny random hermit thats black with white stripes down its legs.
yo is this cuc good for a 20 long
4 x Astraea Snails
$3.00

4 x Assorted Hermits
$2.60

1 x Blue Leg Hermit Crab
$0.60

10 x Dwarf Cerith
$1.70

2 x Emerald/Ruby Mithrax Crab
$10.00

3 x Mexican Red Leg
$2.55

5 x Nassarius Vibex
$2.50

1 x Fern Caulerpa
$6.00

 

[lapin]

Might be a bit too many hermits.

 

[NoahLikesFish]

is the issue algae or shells, cause i have tons of seashells and also tons of shells as rubble in my tank