Mad Duff
Fishaholic

Across
1 Heavenly Cichlid (5)
3 Fish with good sense of humour (5)
6 Poecilia Reticulta (5)
7 2.54 centimetres (4)
8 Golden, Tiger and cherry (4)
9 See 4 down
10 How many lines does a Nannostomus Unifasciatus have (3)
12 Mickey Mouse, Sunset and Tuxedo (5)
14 Decorative timber (7)
15 Fin between ventral and caudal (4)
17 Spiny, Fire and Tyre track (3)
18 3 across lives here (7)
19 Number of bands on a Sexfasciatus (3)
20 South American river (6)
Down
1 White with pink eyes (6)
2 Strongly Alkaline PH reading (5)
4 & 9 across, Water quality check (7,4)
5 Family of South American dwarf cichlids (12)
11 Small brightly coloured tetra (4)
13 This goldfish should be king of the tank (4)
14 ----- Cave Tetra (5)
15 ----- Seemani or Shark Catfish (5)
16 Fruity Tetra (5)
Enjoy!