Question??

2 are fine for a 90. If you get those, make sure they are 110v. Those are Chinese knock-offs and many are 220v 50Hz and you need an adapter. Also, they only come with suction cups. If you buy the magnet mounts they end up being basically the same price as Koralia K-4's.
 
That would be good flow. I have heard some good things about them. Haven't owned them though. If you pay a little more you can get koralias and they will have the magnet mounts as mentioned. Magnet mounts are a ton better than any suction cup.

If you do get them be sure to do a review.
 
Pay the extra for the Koralias.It'll be worth it to keep the pumps from falling and causing a sand storm.
 
Pay the extra for the Koralias.It'll be worth it to keep the pumps from falling and causing a sand storm.

+1 Yote. Go with the Koralia. They are a good power head for the price. You can also go with Tunze, but it will cost more.
 
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