. Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects. Fig. 136. M.\res Tail {Life sisc)Fig. 137. Moneywort {Life sise) 188 GOLDFISH VARIETIES AND mon in all the Eastern States, growing in damp places, usually near orbordering streams. Considering that it is scarcely even a bog plant itdoes remarkably well in the aquarium, where it grows straight up to thesurface of the water, regardless of where the light comes from. It is afair oxygenator, but if kept submerged the leaves gradually dwindlein size, so that it is best to gather a new stock once a y
. Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects. Fig. 136. M.\res Tail {Life sisc)Fig. 137. Moneywort {Life sise) 188 GOLDFISH VARIETIES AND mon in all the Eastern States, growing in damp places, usually near orbordering streams. Considering that it is scarcely even a bog plant itdoes remarkably well in the aquarium, where it grows straight up to thesurface of the water, regardless of where the light comes from. It is afair oxygenator, but if kept submerged the leaves gradually dwindlein size, so that it is best to gather a new stock once a year, August orSeptember being the best season to secure vigorous plants. QUILLWORT Isoetes is a widely distributed genus of a number of species. It isfound in the mud and sand at the edges of streams and ponds. In size it. Fig. 138. Quillwort (Reduced one-half) varies from a few inches to several feet. The small submerged speciesare worth trying in the aquarium, as they are tenacious of life. Theleaves rise from the centre of a circle or rosette, producing a very prettyeffect. Quillwort should be placed in a good light. It is eaten by somesnails and fishes. TROPICAL AQUARIUM FISHES 189
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