. Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects. d of the surface leaves. It should, how-ever, only be kept with tropical fishes unless it is intentionally given togoldfishes to eat, as they are fond of it. The stems and roots when takenare usually swarming with various aquatic insects and many of these are good fishfood it is best to thoroughly rinsethis and all other plants before placing in the aquarium. HIPPURIS Formerly used as an aquarium plant. Mares Tail has been over-looked of recent years, possibly on account of i
. Goldfish varieties and tropical aquarium fishes; a complete guide to aquaria and related subjects. d of the surface leaves. It should, how-ever, only be kept with tropical fishes unless it is intentionally given togoldfishes to eat, as they are fond of it. The stems and roots when takenare usually swarming with various aquatic insects and many of these are good fishfood it is best to thoroughly rinsethis and all other plants before placing in the aquarium. HIPPURIS Formerly used as an aquarium plant. Mares Tail has been over-looked of recent years, possibly on account of its tendency to stand abovethe water. Used in a suitable way this feature could be utilized toadvantage. It transplants well and will thrive under varying conditions,but does best in ample light. Occurs in swamps from Labrador toMaine and also the Pacific Coast. MONEYWORT Lysmachia nummularia or Moneywort is also known as WanderingJew, Creeping Jenny and Herb-twopence, the latter name and Moneywortno doubt being derived from the rounded shape of the leaves. It is com- TKOPICAL AQUARIUM FISHES 187. 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
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