If you have plants in your tank.
1	If	if	SCONJ	IN	_	3	mark	3:mark	_
2	you	you	PRON	PRP	Case=Nom|Person=2|PronType=Prs	3	nsubj	3:nsubj	_
3	have	have	VERB	VBP	Mood=Ind|Number=Sing|Person=2|Tense=Pres|VerbForm=Fin	0	root	0:root	_
4	plants	plant	NOUN	NNS	Number=Plur	3	obj	3:obj	_
5	in	in	ADP	IN	_	7	case	7:case	_
6	your	your	PRON	PRP$	Case=Gen|Person=2|Poss=Yes|PronType=Prs	7	nmod:poss	7:nmod:poss	_
7	tank	tank	NOUN	NN	Number=Sing	4	nmod	4:nmod:in	SpaceAfter=No
8	.	.	PUNCT	.	_	3	punct	3:punct	_
