. 2015 Dec 7;3:e1430. doi: 10.7717/peerj.1430

Table 1. Water quality parameters (bacterial abundance [BA], nitrate (NO $_{3}^{-}$ ), nitrite [NO $_{2}^{-}$ ], ammonium [NH $_{4}^{+}$ ], and phosphate [PO $_{4}^{3 -}$ ]) and H. caerulea choanocyte proliferation rates in a flow-through aquarium fed with water from the old (+ biofouling) and new inlet pipe (− biofouling).

Means ± SD are shown (n = 3). Percentage increases or decreases in the aforementioned parameters between the old and the new pipe are given. NA, not applicable; i.e., no significant difference.

	Water quality parameters
	BA (×10⁵ mL⁻¹)	NO $_{3}^{-}$ (μ mol L⁻¹)	NO $_{2}^{-}$ (μ mol L⁻¹)	NH $_{4}^{+}$ (μ mol L⁻¹)	PO $_{4}^{3 -}$ (μ mol L⁻¹)
Aquarium water + biofouling	1.9 ± 0.1	0.86 ± 0.04	0.09 ± 0.01	2.42 ± 1.73	0.04 ± 0.01
Aquarium water − biofouling	5.9 ± 0.0	0.50 ± 0.05	0.05 ± 0.00	0.57 ± 0.13	0.05 ± 0.01
% increase or decrease from old pipe to new pipe	217	−42	−42	−77	NA

Table 1. Water quality parameters (bacterial abundance [BA], nitrate (NO3−), nitrite [NO2−], ammonium [NH4+], and phosphate [PO43−]) and H. caerulea choanocyte proliferation rates in a flow-through aquarium fed with water from the old (+ biofouling) and new inlet pipe (− biofouling).